I think they are a spoiler race, so I thought I'd post it here. Units are listed as Centurions, Decurion AA Mechs and Praetorian Combat Mechs. They appeared on a planet with some ruins. I didn't expect this to work at all, but it is far worse than I expected.
I saw they were what looked like a lot of armoured vehicles, am guessing centurions might be heavy infantry. I made an invasion froce with about 25% more units than them, mostly made up of "tank destroyers" - medium vehicles with medium armour and two medium anti-vehicle components, and some with anti-infantry capability, plus an HQ that can cover the unit capacity. They land on the world and when they hit they seem to penetrate and destroy a unit about 75% of the time not terrible.
The problem is my units are hitting a target only about 1 in 20-40 shots. First round of combat I destroy a handful of their units, next round of combat they utterly destroy all my forces with a 100% hit and kill rate. I am just wondering what is happening here. Is it just down to them being fortified or them having much higher tech weapons or something completely different? I can't see any stats on chance to hit with my components or forces.
I know most people have been talking about using invasion forces of a minimum of twice the tonnage of what they are assaulting, so I wasn't expecting a victory of any kind; I was just testing things out of curiosity. It doesn't seem like 5x the tonnage would even come close to winning this fight.
P.S. This is my first proper invasion, so I'm sure I've missed a few obvious things from an invasion check-list anyway.
P.P.S. Didn't know if it was necessary in the spoiler forum, but I've added some spoiler tags just in case people don't realise they are in this forum when reading this post.