In the trench warfare of the First World War, the mud was often knee deep, although it sometimes reached well above the soldiers' chests. These conditions were obviously horrendous, and made it almost impossible to fight effectively. I know that several combatant nations issued jackboots (i.e., boots that slip on, and don't have laces) to their infantry, most notably the Germans.
Although it would have been difficult for anyone to keep their boots on in the thick, deep, sucking mud, I imagine that it would be even worse for troops wearing jackboots, which aren't quite as snug as laced boots.
How did soldiers who wore jackboots avoid losing their foot gear in the mud?