Muster bay horde battle
Posted August 13th, using material originally in my Grunt-Jackal spawning trick article
NOTE: Expansion coming soon I hope, when I begin my movie coverage
The Grunt-Jackal spawning trick allows you to build up a horde of Grunts and Jackals in the passage network running alongside the boarding room. By then triggering the muster bay, you can give them an instinct to head for its upper level. It's quite a job actually getting them there however, because things get rather congested along the route and also in the room itself, and you'll keep having to try and clear things up, plus you generally need to get quite close for them to move along at all.
Some may end up getting killed by friendly fire in the process, and you have to watch out for your own health too of course. But with effort and patience you stand a chance of at least getting the majority there, resulting in a very crowded upper level.
Crucially, it's also possible to get a checkpoint afterwards to serve as a battle start checkpoint (there are a couple of options), and then you're set for plenty of fun, attacking from either of the two entrances or from down below (e.g. with a sniper rifle and throwing grenades).
I'll expand on all this later when I've explored it more fully and have an accompanying movie to show, but for now I'm just outlining the potential here. Suffice to say, I've already had some fun with it and things can be pretty spicy!
Note: In case you were wondering, I don't think there's any way to make your horde collect on the ground floor. Actually, if a covie falls down to it, he'll head back up. I've seen a few Jackals do that, and also a bunch of Grunts when I threw a grenade.