>>12065221Tanks are quite good at crossing mud and getting themselves and each other out of ditches. You've really got to get a direct hit with artillery to take out a tank, and it has to be a pretty sizable shell at that.
But if you're towing around artillery, you've lost your only advantage which was mobility. Tanks are faster than horses anyway, and horses really suck at crossing mud. So I would drive to your artillery and machine gun the unprotected crews.