Year: 2174At the end of last year the UNSC - General Lee reported an alien contact, he has since made it back to the UNSC lines and UNSC high command has ordered the carrier strikegroup as well as the Light Attack Strike Group to move immediately to investigate and understand its purpose, leading theories suggest it could be a remnant of the mercury colony, as such the UNSC is bringing all the weapons as only one contact was detected but there could be more in system.
The Strike Group moves towards the IV planet in the system where it was detected, at this point it has not moved and as such Captain Jeff Helfrich of the 1st Carrier Strikegroup and leader of this expedition orders that the Light Strike group move to gain sensor lock and investigate, eventually the Light Strike Group make contact, as they do they come under no fire and decide to wait, no other forces are detected.
The Captain not knowing how best to handle this situation decides that the carrier group shall remain and attempt to initiate communications if possible while the Light Strike group continue following it and staying in contact.
As the order is given, the Alien ship moves off and towards the sol jump point, at this point Commander Arturo of the UNSC Calcutta leads the strike group and orders it to follow as ordered by the captain, as the alien ship approaches the sol jump point they have to choose what to do, either allow this to happen or open fire and possibly damage relations forever, with no ability to contact anyone but inside the strike group within a reasonable amount of time, commander Arturo Uterback not willing to risk the location of sol and its defences opens fire with two vessels, the UNSC Calcutta and UNSC Pike, both carry a heavy hitting MAC cannon capable of smashing a ship to pieces, even though the taskgroup contained 16 vessels, she decided it would be wise if possible to capture and maybe save some force or at the very least fire warning shots forcing them to retreat, neither happened.
On the 13th of January at approximately 3:53AM the UNSC Pike and UNSC Calcutta Opened fire, becoming the first ever time a human vessel fired upon an alien craft, the main MAC cannons coiled up and within five seconds two MAC rounds went straight into the side of the alien vessels dealing heavy damage and slowing it to 1 km/s, it is estimated that at this time the engines were either destroyed or it was hit so hard by shock damage the crew were not able to issue commands properly, before the enemy ship could change course, the UNSC Pike opened up with its point defence cannons at point blank range and the enemy ship was engulfed in flames, the vessel falling to pieces as life pods launched.

Even the Commander had no expected to destroy the ship and as it did he just sat their looking out of his command bridge shocked, as the UNSC has some honour they immediately began to launch shuttles to at the very least recover some of the escaped, this would also be useful as they could provide further information on their now enemies capabilities and their race.
It was just moments after when Captain Jeff Helfrich saw the explosions off in the distance and ordered an immediate communication to the UNSC Calcutta, it would be too late though, after the engagement, the captain immediately ordered the commander of the UNSC Calcutta questioned and he also requested all survivors of the alien ship transported to his flagship the UNSC - Sigma.