

The Sherman DD was an amphibious tank used during the Normandy invasions.
The main role of the M4 Sherman DD was to assist infantry in breaking through
enemy defenses and then rapidly penetrate far behind enemy lines to disrupt
supplies and communications. It was well-suited for this role by being
highly reliable and by having a powerful HE gun. By 1944 it had become the
main battle tank of all the Western Allies, and over 49,000 were built.
 
