i finally found how to easily kill cuirasiers no matter how much they are.
You need cavalry archer and play in a map like bayou or seminole in order to get 25% more atack for archers unit. So you get this
with that hight atack you can easily kill cuirasiers, because that map doesnt give additional bonus hitpoints or damage to cuirassiers and in that match there were no allie cards that give them more bonus hitpoints or damage, resistance, speed, etc.
So Its the best map for russia to kill a french 1vs1. Because cavalry archer with 30% resistance to meele and 25% more atack than normal, cuirasiers are very weak. But in order to defend your city you would need to have cards to train 40% faster cavalry and all tech for -% train cavalry time, and card for more hitpoints for buildings in order to get time to kill cuirasiers if they are atacking walls.