Sergeant is drilling a group of uniformed men, who are a pretty sloppy lot - shoestrings untied, shirt tails out, collars unbuttoned, hats at odd angles etc.
Sergeant drills in a march, but they go in the wrong directions, trip while turning, and so on. Finally, he has half of the group marching left and the other half marching right. He instructs them to reverse direction and turn and march toward each other. Instead of passing between each other, they meet head on and all fall down.
Sergeant weeps bitterly into a large handkerchief, steps among the prostrate bodies and pretends to jump up and down on them.