To help with the break out from Anzio, the commander of the 3rd Division (US) Gen. J W O'Daniel  supported the idea of using metal sleds pulled behind tanks, to attack heavily defended objectives. This is a training exercise in June 1944.  Seems like a seriously bad idea.

Battle Sled

Officers of USAAF’s 340th Bomb Group surrounding a Fiat 1100 used by the unit like staff car (note the large white star on the door) heavily damaged by Vesuvius eruption of March 1944. Clearly visible the windscreen completely shattered by the bombardment of lapillus and the right lamp ripped off. Victor Sierra

Fiat car destroyed

A sleeping MP of the 29th Infantry Division.