There's a lot of funny Hollywood-inspired myths about tanks. There's this notion that a tank is some sort of invincible off-road breaching machine that annihilates anything under its glorious treads.
The reality, especially for older WWII tanks, is honestly kind of pathetic by comparison. Tanks are notoriously susceptible to mechanical break-down and have massive maintenance requirements just to keep them running -- and that's in ideal conditions, not actual battlefield conditions. Now, it's true that tanks are relatively good off-road vehicles, for obvious design reasons, but not nearly as good as lots of people seem to think. "Off-road," for a tank, means grassy fields, hard-packed sand, gravel, and other relatively flat and unobstructed terrain, where tanks can drive quite well. Actual rough terrain with lots of uneven elevation, ground cover, rubble, trees, large rocks, or basically any obstacle whatsoever is a great place to drive a tank -- if your objective is to get your tank stuck in a ditch, permanently, with an entire track coming loose. Driving a tank into rough terrain is ludicrously stupid, despite what Hollywood-style imagery would have you believe.