I seem to can't find a solid counter against the Mongols. I know they gather in huge numbers and leave their cities open. Right now they completely destroyed all of my Crusader Cities, one of them was a Citadel which took them 4 times before they finally conquered it. I re-invaded and captured only 2 cities out of the 6 I lost from the Crusades. I am Venice and I've developed 3 armies mixed with mostly gun-men, cannons, and Venican Archers, cavalry and spearmen but I still fought them and lost 2 of my 3 armies in order to destroy all of the Mongols.
Does anyone know a good strategy to crush the Mongols with Venice? They seem to be extremely good at everything, even melee combat.