Mortar fire
Bienvenue a board, Ben. (The only French I know I learned on AC flights.)
Good to see AC attempting to get closer to its customers. As I learned when (briefly) attached to an infantry unit (long story), when advancing on the opposing line, it's always safer to run *towards* the mortar fire because eventually you get close enough that they stop using mortars. (You might have some other problems to deal with at that point, but at least it's not mortars.)