Board Thread:Warhammer 40k General Discussion/@comment-7671639-20130511210709/@comment-9433138-20130514194336

Plus we could always enlist the orks into helping us. All you have to do is to point them in the direction of the tyranids and let them fight it out.

If we were to make a united army, then we would have to consider the roles of our individual forces. Orks make an excellent first assualt force, especially if we give them Imperial guard to help them. Tau are excellent marksmen, as I know from my scout days. Dark Eldar, as sick and disgusting they are, are good at hit and run attacks although how useful those would be against an army that can replace its losses rapidly is debatable. Space Marines, loyalist or not, could be used as excellent shock troops, fighting the tyranids where they're needed most of all. Eldar have a lot of specialist forces, but would they even join us? I believe so, they know from Iyaden that the tyranids are a large threat.

Now, Ultramarine, what is the second solution?