noun
forced march
Primarily a military term for a march pushed beyond normal limits, often at high speed or over long distance.
部隊は夜通しの強行軍で目的地へ向かった。
The unit headed for its destination on a forced march through the night.
noun
pushing through on a tight schedule;
Figurative extension of the military sense; used for any activity carried out with relentless speed and strict deadlines, often implying strain.
締め切りに間に合わせるため、チームは強行軍で作業を進めた。
To meet the deadline, the team pushed through the work on a very tight schedule.