Shermans of the US 9th Army in German mud, early 1945. 

 Tracks distribute the weight of a tank, like laying your own road, biting into it with the drive sprocket and pulling yourself along it. However if you belly out in mud, the tracks can spin around and the tank becomes stuck - then it’s out with the tow rope (seen at the ready here on the front right) or shovels and timber are needed to give the tracks purchase.
(Thetankmuseum)

Stuck like glue

A brand new 76mm Sherman M4A1 tank of the 67th Armored Regiment enters the Norman village of Saint Sever Calvados, August 1944. - Note, that the crew wear steel helmets.

Sherman M4A1

Crew of an ACS M10 (Wolverine) self-propelled gun, 703rd Tank Destroyer Battalion of the 3rd Armored Division, pose in a pit near the French town of Marigny.
