The term 'death march' is often used to refer to a forced march of prisoners of war or other captives, usually over a long distance and under harsh conditions. The term can also be used to describe a difficult journey or task. A DIRGE is a slow, mournful song or piece of music expressing sorrow or lamentation, often for the dead. Therefore, the crossword solutions for the term 'death march' can be summarized as a long, difficult journey or task accompanied by a slow, mournful song or piece of music.