Which preposition to use with firer

across Occurrences 1%

They, too, had brought quick-firers across the bridges and, taking cover behind some of the houses, trained their guns upon those from which the French gunners were firing their last shots.

of Occurrences 1%

They must have set those anti-aircraft quick-firers of theirs in fresh elevated emplacements after the Yankees had taken the measure of their power to do harm; but the trap, if such it was intended to be, had failed to catch a single victim.

on Occurrences 1%

"Again there was a succession of reports from German quick-firers on the far side of the misty valley and like echoes of detonations of high explosives; then the row of expanding smoke clouds was prolonged by several new ones.

to Occurrences 1%

[Footnote 12: The instructor should take cognizance of the fact that the proper aiming point is often affected by the personal and fixed peculiarities of the firer, and if unable to correct such abnormalities, permit firer to direct sight at such point as promises effective results.

Which preposition to use with  firer