Say, for example, a powerful raider attacks an alliance member. The alliance member is too weak to fight back on his own, so he calls upon his alliance buddies to help fight back. Now, say that everyone in the alliance is too weak to take on the raider individually. No problem! The way Politics and War currently works, one of those alliance members is going to perform a suicide charge to weaken the raider while sacrificing his own men on masse, so others can actually win.
This is a major problem, and is highly illogical. There should be some way where alliance members can lend strength to other alliance members, where members can lend their military units temporarily to another member so that a joint attack can be performed.
Let's be honest, a suicide charge is stupid. Let's make it so that wars are actually winnable without massive, unnecessary loss of life, and where smaller alliances actually have a chance to survive.