Misha goes through a crack in the wall to smuggle at night. How do the other boys get across?

The other boys climbed the wall and went over the barbed-wire.

I knew that somewhere along the wall Big Henryk stood as tall as he could with Kuba on his shoulders, and Kuba was draping two thick coats across the barbed wire and hauling himself over and down to the other side, then tossing over the wall the rope that Big Henryk would winch him back with.