在行军中，在行进中
If soldiers are on the march, they have started marching to a place.
Soldiers on the march were permitted to break their fast.
By the time they got to Palestine, some of the Crusaders had been on the march for three years.
The rebels were on the march again, moving towards the capital city.
We are hearing reports that government troops are on the march to confront the rebels.
They were expected to spend days on the march, even sleeping in the saddle.
See also: march noun (SOLDIERS' WALK)