Having serious issues with the quest to destroy the bridges in part three. When I get to the dialogue with Black Garius, all the spawned enemies fail to properly trigger as enemies and I can't attack or damage them at all. I've tried everything I can find or think of to a) force them to become hostile or b) skip the battle entirely and trigger the next part, but nothing is working,

I have also tried reloading as far back as just prior to entering the war room stage, to no avail. I just want to finish the campaign with my character :( But I can't find any way to get to the next stage, and can't find any solutions online to fix it.

Ah, thank you greatly! That was not the command that I found online, and that one actually works. I don't know yet if the end of the battle will trigger correctly (though I don't see any reason why it won't) because the game crashed part way through, but it does that intermittently after alt+tab'ing out.

Yep! Worked just fine, and I finally got to see the wall scene! Squeee! ^.^

I am even more grateful for this fix (that I had to remind myself of XD Hostile, not enemy...) since it appears this encounter is just permanently bugged on my copy or something. At this point, I'm coming through with an entirely different character, and same problem...