Speaking of army sizes, I recently lost a ranked game against a player that was using Mongols. Replaying the recording I found out that he rushed villagers until he had 140.
Interestingly, in order to match my army of 100, he did not hesitate to kill 40 of his villagers in order to build an army that could counter me. That seems like a tough call, but in the long run he ended up beating me, so I guess that’s the right thing to do.
Consider doing the same in critical situations, especially when you hit the 200 cap and realize late that you didn’t build any battering rams, stone throwers, or cannons to lower your Keep.