In a way, though, that's a good thing, because if winning the game required a lot of high-level units, players would be screwed by the awful movement and combat AI. Your troops don't have much of a problem getting where they want to go -- unless they're marching with other troops, which means that they'll frequently get tangled up in each other and just stop walking for a few seconds. Sending a large group of troopers anywhere on the map is a virtual guarantee that you'll end up with a long string of soldiers spread across it -- easy prey for opponents.