urbans or praetorians?

[Uesugi Kenshin]

I don't have large city garrisons because nobody can touch me, if anyone comes close I either bribe them or merc them to death. To expand on the Archer Auxilia strategy you can also set all your cohorts to fire at will so that if the enemy gets close they are scattered by a massive volley of Pila.

[Sam Adams]

make sure you have a doctor or surgeon attached to your armies leader and you wont have nearly the same problem with attrition. Besides, urban cohorts ive noticed tend not to lose many men anyway. Especially when you soften the battlefield with archers first.