The guns are the first thing to go cause of leaky armor. The bigger it is the more likely it is to get hit. And, if the guns are 300+ kT (I don't know, never checked) on massive mount, then they are the FIRST to go, before the leaky armor (emissives are 300 kT of protection). The leaky armor in B5 isn't properly done... the armor should be 2 or 3 times the damage resistance of the component they're supposed to protect, or more likely than not the component's damaged more than the armor.
The fighters, you can deal with ramming. Primary strategy maximum firing range, secondary strategy ram. Your weapons have 1 reload rate, right? Then when they can't target, they can ram. But if they're 3 reload it's a little tricker... but just slap in one gun that's one reload. And my US ships should be immune to fighters with their 400 damage soak.
Anyway, a decoy huh. Brilliant

. I didn't really expect the 100 US ships to turn the tide of war but only hold their own against the 100 I sold you earlier (or 124, I don't know where he pulled the 24 from I didn't sell him them, he must have kept some in reserve). And Vorlon fighters? 200 damage cannons, and emissive armor? Well great.
So Marxis's plan worked. Incredible. I can't believe Tobor pulled it out of his ass. So is it subjugation, then?

.
The 60 move troop transports are a real pain in the ass unless you're ready. I was thinking of doing it to U235 early on, but changed my mind, mostly because it was out of character for Marxis to want to kill his own species, but also because I thought it really cheap (like I thought of how I got 300 ships before anybody else had anything really cheap but ah well I'm glad I held back). A few mines should deal with it. Most of my early worlds have 100 mines over them. I took all the Yolu colonies in one turn from U235 the same way.
Also, Black Sabbath can hit fighters. The Vorlon fighters must have just kicked a lot of ass.