I was in a battle against Poland, doing pretty well all along the line, most of them were routing. Then the Winged Hussars charged into one of my flanks. I had reserves behind the line, so I figured I would be able to contain them. They chewed up the line unit, and the reserve, and the cavalry I brought up to fight them, and all the infantry I sent against them. In the end, that unit of PWH single-handedly destroyed MY ENTIRE ARMY. They only lost 9 men.