A 040/041 self-propelled Morser (Karl Gerät) fires on Warsaw during the August uprising, 1944. This particular unit, "Ziu", was 60cm. Note the "munition schlepper" seen to the far left (behind the Morser) with a fresh round on the gantry, ready to be loaded.
One of the 2 ton 60cm mortar rounds from "Ziu" strikes the Prudential building in downtown Warsaw.