The AI is really stupid

[The Spartan (Returns)]

i won 5 clear battles with Spartan Hoplites (sometimes the enemy kills only 7 troops!) against Urban Cohorts! the AI retreats the Urban Cohort after 6 seconds and throws pillas again (before they retreat i have killed like 7 Urban Cohorts) sometimes they throw pilas while fighting! then i win never losing less than 50! but if im the Romans using the Urban Cohorts, i throw pilas, charge, and fight. never retreating. i win but i lose at least 33 men. this is really weird. (no upgrades, no advantages, no height advantages. Map: Grassy Flatland) p.s. the Roman AI do that alot. 1.5 patch