How would you beat my missle troops?

[LordArioch]

Cavalry flanking work well as a counter, so it's good your flanks are guarded. Also single units standing in front of an army can draw fire.
Archers and xbows work well because they build fast and can rout weaker forces, but just consider what would happen if you were attacked by 95+ good quality infantry with shields. I'd probably favor the infantry if they had units in front to draw fire, as they could probably go through your flagellants pretty quick.

It sounds like you have a pretty well thought out setup though, so flying units, storms, or archers safest. But keep in mind you probably aren't fighting similarly sized armies of good infantry.

This is what makes scouting so important in MP. If I saw that beforehand and had time to counter I probably could come up with something, but if I didn't scout I'd be hopeless trying to come up with a fast response. This is probably the most famous marignon tatic though, so people will be expecting it if you play a multiplayer game.