The 15th of March in the Ancient Roman calendar, on which day Julius Caesar was assassinated.

(military) Arrangement of troops for marching. / (military) Course or direction taken by an army or body of troops in marching.

Alternative spelling of frogmarch

Alternative spelling of frogmarch

(military) A movement on foot by soldiers or prisoners of war, who must, in order to satisfy a military requirement, travel at a speed or in adverse conditions that would normally tire them excessively.

Any of the family Bibionidae of dark hairy flies. / Tipula hortulana (syn. Bibio hortulanus), now of family Tipulidae of crane flies.

A forced movement of people, on foot, in such circumstances that many die during the journey.

Alternative spelling of frog march

Alternative spelling of frog march

(intransitive, idiomatic) To gain an advantage unobserved. / (intransitive, idiomatic) To start early.