An upgraded M4 Sherman with added and crated concrete AWA sand filled bags for added protection against the superior German guns
follow up photo,see 'Field conversion'
taken from fb/War History online

After the welding

An interesting US Signal Corps photograph of welders constructing racks for protective sandbags onto an M4A3E8 Sherman from the 42nd Infantry Division.
taken from fb/History of WW2

Field conversion

Photograph shows the first M26 Pershing tank (still designated as T26E3) to be knocked out in combat in World War II, which occurred on its second day in action. The hole in the gun mantlet marks the penetration of an 88mm round from a German Tiger I. Two crew members were killed.

The action occurred on February 26, 1945. The T26E3 was knocked out in an ambush at Elsdorf while overwatching a roadblock. The tank displayed the name "Fireball'

Sources: US Army and Hunnicutt, R. P. - Pershing, A History of the Medium Tank T20 Series, 1996, Feist Publications, ISBN 1-112-95450-3.
taken from fWW2 uncovered