Effectively taking over some castles without a single unit lost. Once they run out of arrows you just retreat and re-siege.

In attacking sieges you literally just get them to hold outside the wall and kill everyone on top of the wall.

They can mow down Mamlukes and Swadian Knights, outrange Rhodok crossbows, and can break down Huscarl shields like they're nothing due to their insane range, accuracy and spammability. Especially if you have terrain to your advantage. Tbh I think Vaegir top tier archer spam is the best in the game for taking over the map if we're not talking about auto-resolve fights and AI vs AI fights.