Wouldn't that entire process be a little buggy? What if the horde reaches level 2 and gets a banner carrier and then the trebuchet is destroyed. Technically the banner carrier would eventually respawn a trebuchet which might look wierd.
You might have to change around some behavior stuff on the trebuchet. Look at archers because their attack takes precedence over infantry when they are in a combined horde.
Also, the most irritating thing about that is that when all the ranged units are destroyed the melee units won't attack anything at all because they are told not too. The game needs to uncombine Rank 1 units when all of one type is killed, but doesn't.
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