Successful strategy preparation lives through deception at its coreDespite old USA's overreaching espionage network, they either didn't have the same ability anymore, or new EUSN did a very good job at hiding its current developments, even after the ships using them were already flying for years in space.
The frigates successfully assumed firing positions uninterrupted by enemy firing attempts, signaling that the about 40m km range artillery shells would indeed be outranging CSA's missile strike based armaments as hoped. The absolute secrecy regimen however was also showing its downsides, as the crews were severely inefficient and confused about the 'handbook' procedures when ordered to fire from barrels that had never been allowed to fire before.

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When the bombardment was finally taking place, two half sized testing salvo flew ahead to measure the performance of CSA's unique orbital defense base, which they constructed with the exact intend to ward against missile strikes from outside of earths atmosphere. By being able to intercept intercontinental and space based missile attacks from above, they probably hoped to void the old damocles sword of mutual assured destruction, and become finally immune against retailiation.
So if this orbital defense base and the smaller support fleet above earth could actually fend against shell ammunition as well, the whole plan would be jeopardized.

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The performance was admiral-ble however, and despite the tight parameter, only about meager 7 shells per salvo could be fended off, making the defense penetrable with even just a single Psion frigate firing in theory.
After their first consternation about this succeeding perimeter break had been overcome, CSA dropped their arrogant entry stance and involved what counter-missile batteries they had at their disposal. They however had not even closely enough to really mount a defense against such ordnance density, not to mention that their AMMs were still weapons tuned to much larger missile targets, and thus by default completely unable to deal with mere guided shell ammunition.

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A downside to the tightly constructed artillery ammunition was however its relatively low yield, making it difficult to penetrate modern duranium based armor. The heavy defense base managed to resist the first 160 impacts, making a later targeted Sheffield destroyer the actual first sunken ship victim of this war.

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The beam defense base followed shortly after still, causing CSA's orbiting forces to disperse in panic.
No counter fire had been received up to this point and CSA ships were already fleeing from various surface damage, but a new threat was clearly introducing itself. China seemed to show colors in its weird 'each others protegee' relation with CSA, as some of their ships transgressed Open Palm's skirmisher radar perimeter and ignored around 10 warnings over 5 minutes. Since China could not access a military resource reserve as CSA could, they took the route of having a vast side of their forces being created as smaller sized Corvette vessels, which should in theory be able to deliver short ranged missile strikes under the radar.
Nathan Knight's command foresaw this possibility however, and ordered the command frigate to become equipped with an especially tuned radar device, that hopefully could still see them before their deployment range, and it seemed to have worked out. After the initial warnings were ignored, it was deemed too risky to let the ships close in further, so one salvo per ship was given out.

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The size was exactly enough to dispatch exactly one vessel per frigate salvo, contributing to very clean and efficient ammunition usage.

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With China now officially involved into the war tactics, conscious ordnance economy would be even more critical, as EU's reserve could easily prove to be too few to deal with both sides cooperating.
After succeeding in repelling the Corvettes approach and still dealing with the remaining CSA vessels in range, a disturbing move seemed to come from China's main fleet from the south. Instead of running into a another,-as they must have seen by now-, futile direct confrontation, chinese admiralty wisely concluded that the only way to win against the glaring range and speed advantages they were presented with, was to cut their enemies supply lines, so the dreaded combatants would eventually fall harmless by themselves.
This meant assault on the Venus and Mercury bases, where fuel and ammunition was stored, -and with the fleet currently in action-, also unprotected.

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Their position was more than desperate still. A quick calculation showed that they would barely be able to approach Venus before Open Palm could fly all the way back to Mercury Base, restock and rearm, and then still arrive at Venus early enough to void any occupation attempts before they happen. The only thing at risk was again the newly formed emergency ground force command which operated from Venus' Infantry regiment under a fresh and just hours before promoted major general.
When seeing how quickly their enemies were to refresh their momentum however, the chinese fleet stopped even the Venus assault, and instead set a desperate course deeper into space closely behind earth and towards their freighter fleet.

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They must have know their position was hopeless at this stage, as there was no option for EUSN to ignore the threat that this fleet still posed, especially after potentially joining forces with America's main fleet body.
A carefully measured strike solution was given out that expended about 70% of the Psions magazines on the fleet, and targeted nearly every ship they had.

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After some correction gunnery and a total of 90% of the magazines, nearly all of the Chinese fleet had been completely decimated, essentially factoring them out of the equation.

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They picked final siding too hasty, and foolishly put everything on the one card that their corvettes might smuggle undetected into devastating alpha strike range. Yet at the moment that the communication attempts from EU's side revealed that their enemies had machinery dedicated to block against such attempts, must have been the moment that they recognized their early cornered defeat that had only to play out.
While dealing with the scattered remnants of the still not entirely obliterated chinese fleet, CSA's own detachment of short range defense corvettes approached. Again probably driven by arrogance, these ships didn't even partake in the assault on EU when it happened, and instead were taking training flights in the vicinity of earth, probably thinking their assistance wouldn't be needed.

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Captain Schaefer vetoed the plan to shield Venus with the Escorts however after seeing 2 of the 3 remaining chinese ships miraculously survive even the last salvo. Instead they were to be finished first with the debut test of the railgun turrets, even if that put Open Palm at risk of counter-fire.

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No close range counterattacks were received from the already heavily crippled vessels, and Open Palm managed to retreat before the corvettes came into range.

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When they were back they found that the whole detachment had stayed together and also again decided against bombarding Venus.

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Whatever their plans in this situation might have been, they were foiled, as the artillery strikes dispatched CSA's corvette units just as efficiently as they did the Chinese ones.
The group then went on to return to earth to use the remaining 3rd magazine load on the leftover CSA ships there, and also to destroy their ominous moon base and a group of chinese freighters that had just deported some goods for unknown purposes.

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The remaining fleeing freighters that hadn't had contact with earth were instead left to flee into the upper system, until conditions for their return could be negotiated.

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With the removal of these forces, EU's immediate endangerment was over. Though the ground forces of China and CSA were still present and strong, they wouldn't dare to pursue invasion as long as the old cold war retaliation threat was again hanging over them with EUSN dominating the orbit, and their intercepting orbital base de-equalizer gone.
However, the real threat was still to come. Defeating the comparably small chinese fleet and the defensive detachment of America was but a small task compared to the shark that is CSA's real pacific force. Their fleet had been away with unknown destination again, but apparently was still close enough to react quickly to the emergency call they must have received. So after only a couple days of breathing room, EUSN was immediately faced with the closing main fleet corpus.

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Though after the proof of concept, EU's ships were still clearly at an amazing advantage, opposing such a flood of incoming targets might overburden their small contesting capacity easily. There was no doubt that any victory of CSA could in this situation only be bought by accepting to absorb immense losses, but their Admiral must have seen that if there ever was a window to strike, it was now and time would work against them with the EU ammunition reserve restocking.
Consequently "negotiations" consisted only of demands to let the pacific fleet dock at Earth without interfering, and retreating to the mercury station until issues had been resolved. They essentially asked for capitulation, as they surely wouldn't miss the opportunity to hold EU population hostage a second time.
So the navy naturally ignored the windy proposal and instead positioned itself on Mercury, which seemed again to be the destination that their ships were about to take. The first encounter seemed to be a vanguard of highly armored Dreadnought vessels, arguably indeed as a sacrifice, which would cost EU much ammunition to bring down.

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The remaining parts of their fleet pursued other entry points through the asteroid belt, arguably to arrive in time to close in from two sides simultaneously.
The approaching Dreadnoughts were faced when coming close to Mercury, and received again very well measured strike doses'.

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Contrary to the expected tactic, the also vanguard advancing and much faster Amazon destroyers also found an entry vector and approached without support from their main fleet.

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Supposedly they were issued with collecting intelligence on Open Palm, as they stopped at a certain radar range, and started to flee once EU's frigates closed in.

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It was somehow frightening to see CSA so readily sacrifice multiple ships and their crews just to accomplish a single mission objective. What was separating them now from the enemies they once fought?
Choosing another strange entry course, now the main fleet body and threat was at hand. It was disheartening to witness the true size of their armada after they turned on their sensors. Despite the best efforts of the past intelligence team and their gravitational radar prototype on earth, some of these designs weren't even registered and a mystery to EUSN.

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At this point, only one magazine load was left on Mercury, and it was now evident that it would not be enough to strike them down, but maybe enough to at least cripple them all?
Some pre-engagement outriders tried to lure the frigates into further ammunition waste, or the surely more grievous mistake of trying to engage on railgun range.

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The bad news wouldn't end, when the Trafalgar class capital cruisers showed amazing resilience, being able to absorb a whole salvo of all frigates at once (10% total load) while only getting moderately crippled.

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Then interceptive fire started and took away about 12 shells from each following bombardment. When about 60% of the magazine had been spent, a surprisingly large amount of CSA ships still went down or fled, making the field look much more manageable.

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In a massive consecutive burst, the last flames of the Psion's artillery were expended. Whatever survived this would most likely keep staying a problem.

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If it hadn't been for chinese interference, EUSN would have cleanly won this conflict and to CSA's surprise...

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...4 destroyers and 2 cruisers survived the punishing artillery without or with little touch from roaming flak impacts. Another 2 destroyers might be able to repair their damage and join later. Some relief for the admiralty of EUSN, as the odds seemed to stay shifty.
It was not inconceivable to still achieve victory with only the so far little used 6 escort frigates attempting approach, but it would definitely become close. Cmd. Admiral Harrison was now faced with a tearing decision. There was opportunity to fly back to earth and load another 100 fresh produced shells,-not even a full salvo-, which nonetheless could prove to deliver winning advantage in such a close match. However, this would mean leaving Mercury undefended, and other than the last times, the speed advantage would surely not suffice this time.
The first decision was to guard Mercury and wait for movement, so that eventually the Psions might be able to fly for resupply alone, while the lead frigate Jeanne could hopefully evacuate if the situation on Mercury should run dire. A distinct weakness in EUSN fleet doctrine was having only one sensor ship ready, which made separation of force practically impossible, and now that hurt for the first time. Future escort models -should they ever be needed- should include a small reserve missile sensor each at least.
Luckily CSA's movement decisions showed that they were not very eager to perform the suicidal retaliation attack on Mercury, and instead set course for earth

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It was a wise decision considering that the most deciding strategic achievement of bombarding Mercury had been to destroy the now depleted ammunition reserves. This strategic value had however now shifted back to Earth, so if any further engagement was to be had, it had better been about the true source of power - the EU's military industrial.
CSA's shrunken formation flew a wide circle, but did not deviate from their course still.

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Once they got close enough, the finishing stage of the conflict started by starting remaining artillery and the escort simultaneously. The 100 ahead flying shells successfully dispatched another broadsword, and heavily damaged another, causing it to flee.

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Then for the first time in this conflict, fire was opened on EU ships, as the 4 heavier CSA vessels started to unleash their swarmer missile pods once the frigates were close enough.

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Luckily and despite the lack of operation training, the two best instructed frigates still managed to get their defensive fire coordinated, and alone managed to repel any little missile that came their way.

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The frigates waited until CSA saw that they needed to hold their ineffective fire, and then moved in to the real risky part: close encounter. EUSN's so far uncontested encounters were based on superior firing ranges, but this advantage did not find reflection in their escort ships, which lacked a dedicated long range attack cannon. Just a single large gun placement would have easily meant continued retaliation immunity for EU after proving to be able to annul all remaining missile strike capacity, but such weapon did not exist in their arsenal yet.
Hence, close skirmish was costly, and the unleashing intense firefight finally gave CSA an opportunity to land hits in return...

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Despite being outweighed 48.6kt against 37.5kt, the still superior weaponry and specialization managed to slowly overpower CSA's gunnery options. A boon they had to thank Bianka von Krug's third revolutionary development: The fast nuclear gas pipes, which used the radioactive heating material itself to run a series of small dispersed turbines inside the shielded piping themselves to generate and contain energy potential insanely quickly, so the powerful railguns could be fired three times as fast as anything CSA had at their disposal.
The battle confusion made it so that only the "Marduk" could continuously fire however, causing a lot more damage receive as necessary. The confrontation ended with "Junon" and "Wolfshorn" receiving an engine hit and generally becoming disabled, and most of the other frigates suffering some hull damage or disabled turrets too.

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Luckily, no ship was entirely destroyed still, and CSA had hereby basically lost the war.
There was however still a little unknown number of ships in the outer system, and the numerous damaged ships in the inner ring who might still become a threat yet again.
For now CSA was fleeing on all fronts, but to prevent them from recovery and achieve total victory, the escorts were sent directly after them.

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Though the Broadswords did not put up any fight, the Trafalgars were actually able to respond and further weaken the condition of the 4 still battle ready frigates.

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Then the last contact was in order, - a ship that had so far observed the fighting from far Uranus orbit without making attempts of interfering.

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Surprisingly it consisted of a group of 3 ships, which managed to heavily damage another frigate just in the first round of fire.

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They were overwhelmed nonetheless, concluding the conflict without any real ship loss for EU.
It was unknown if there might have been more CSA ships that did not return to aid and might be encountered later, and certainly their and China's freighters were not seen anymore for long. However, even if they might be hiding somewhere out there, it was clear they were in no position of threat anymore for now and many coming years.
Like in so many wars before, bold re-envision of the rules and tools of conflict brought with it an amazing advantage. In ages before, whenever a new technologically more advanced era dawned and for the first time saw war, there were factions that underestimated or wrongly assessed the needs of the modern times, and others that had vision and saw the opportunity. While CSA was too wound up in its old successful war traditions, and China as of its heritage denying new tradition attempted again 'just copy from the bwest', EU had been rewarded for putting their trust into a windy uncertain conglomerate of overwhelmingly young talents. This new age had more than ever rewarded technology over numbers, and with enough ammunition, the whole massive fleets of EUSN's opponents could have probably been defeated by even only two advanced purpose built ships alone.
History normally mentions the commanders of massive costly and outnumbered battles as great generals, even though the truly great commanders are those unremembered geniuses with enough vision and planning to never let it come so far. This uneven conflict however had demanded both excellencies, since even the supreme preparation of EU's admiralty would have been nothing if not for the (mostly) flawless decision making at the still outgunned front.
After CrisisBack home, any ship commander participating in the solar pacification was awarded an appropriate memorization medal, and up to two others depending on personal performance. This also included Open Palm's Admiral Harrison, and the foreseeing plan makers Admiral Nathan Knight and leading inventor Von Krug.

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In some of the rescue operations near Earth, teams of civil engineers that were captured amongst the other military prisoners. In contrast to their Navy's god sworn holy warriors, these had no true allegiance and were forced to add dearly needed brainpower to the space-faring neanderthalensis war parties. As such they readily leaked the secrets of what CSA had been doing in these last years.

It was now confirmed that they indeed had found a method to quickly access other star systems nearby by delving into some unknown ancient alien lore. The origins of that lore were still unclear, and speculations varied wildly from close Roswell over the long before Spain described aztecian "white man", to even ocean ground excavations in the crater that is the Gulf of Mexico.
(or the fact that all aliens land in america first, period.)Whatever it's origin was, the closer circle of navy hard line crazetians who knew of it, regarded or interpreted the possession as godly prophetic sign knowledge, similar in weight to the commandments' reveal.
As such they never really attempted to understand it, and instead only replicated the technology closely, using chanting and superstition to operate the devices (with success somehow). The few found intact engines however soon revealed to EU and SK-Japan the essential theoretical concept behind it, and how to search a solar system to localize the limited exit positions in its gravity surge.
Only one year later, Japan-SK officially announced a close cooperation with EU in all space exploration matters, allowing them to use their new gating ship prototype as well that permanently made the formerly most frequented exit point of CSA (northwest) passable from both sides.

A modernized survey detachment was soon build and sent through by ESA thanks to the helping japanese ships, and the results were relayed to the asian union as well. For further expeditions, Terra Nobilem wanted to pursue an even more ambitious project of permanently fixing a gating device in position - a sort of buoy infrastructure that could adjust to size demands dynamically.
Plans for the future, but for now it was important only to note that the remaining CSA forces had not been found on the other side directly, and also did not seem to try for any contact back home with their now barred in internationally isolated and de-weaponized siblings. However, suspicious appearances of new chinese ships were often seen around the inner solar system and even close to Earth for years to come.

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It was argued that they must hold a base somewhere in deep sol that managed to maintain itself, or maybe they actually managed to also replicate CSA's technology before their benefactors could understand it themself. Yet no definite assemblies of fleet such as from CSA or now SK-Japan had ever been witnessed in deep space, making this bare speculation too.
A few years later, EUSN went to return favor for previous helping hands in the construction of the Mercury base, and general and continued technological advisory, by sending freighting and protection installation towards the first outside colony of humanity (..that western civilization knew of) which the asian union had founded.

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SK-Japan was impressed with that, and also with the successful stellar infrastructure buildup that reduced their costly gating ship operations to the exploration frontier. From now on their and EU's navy started to work together as if they were organizations of the same state.
[---Break---//OOC---]
I rushed the part to this, trying to get all screenshots into one post. There were a couple potential dramatic turning points that could have warranted more expansive narrative (especially directly involving the commanding officers) and separation, plus I also skipped a whole tech section with the jump drives.^^' Reason is of course 7.x being here, and me being occupied with a new game already.
Since I actually wanted to use this setup for an entirely different idea that I didn't even come to use, I will however try to replicate all this in 7.2 once it is there, and then continue like nothing happened without repeating the whole inner war story again.
I think the war was really well balanced though. Despite loosing not even a single ship, and having a utterly ridiculous kill-to-fielding mass ratio, it was a close call, and could have easily ended with my total defeat if I didn't have started so early with the pressing ammunition economy for example. It wasn't really planned, but this became quite a documentation of why tech wins over mass since there were, well, not really equal, but comparable starting conditions.(USA's fleet was huge already even when nobody else had any military ships yet)
Much tension, some learned design optimization lessons, fun game overall. Would play again. 5/5