The first snow of the winter fell. It did not lie for long and, as usual, the roads rapidly
became nothing but canals of bottomless mud, along which our vehicles could advance
only at snail‘s pace and with great wear to the engines. . . . The next few weeks were
dominated by the mud. Wheeled vehicles could only advance with the help of tracked
vehicles. These latter, having to perform tasks for which they were not intended, rapidly
wore out. . . . Preparations made for the winter were utterly inadequate. - Heinz Guderian 1941 October
"Ice Demon" - By Kevin Macleod (incompetech.com)