From Forgotten Soldier, by Guy Sajer:
In no time, it (a tank) had crossed the trench, which was overflowing with the bodies of Russian soldiers. Then a second and a third tank plunged through the bloody paste, and rolled on, their treads stuck with horrible human remnants. Our noncom gave an involuntary cry of horror at the sight.
Young Lindberg, who had been in a state of panic ever since the beginning of the offensive, and who had been either weeping in terror or laughing in hope, took Kraus's machine gun and shoved two Bolsheviks into a shell hole. The two wretched victims were both a good deal older than the boy, and kept imploring his mercy. We could hear their desparate shouts for a long time. But Lindberg, in a paroxysm of uncontrollable rage, kept firing until they were quiet.