... at which point they had no choice but to fire upon the enemy.
They opened fire.
They returned fire.
Aim! Fire!
Fragments of reports from the battlefield.
The first hand-held firearms appeared in Europe in the middle of the 15th century. Well. At least that's what people better acquainted with such matters than myself keep telling me.
Before muskets, there were crossbows, and before the crossbows archers had to make do with the bow and arrow.
Suppose you were a reporter, or an officer in charge of the archers, at, say, the Battle of Hastings (1066 A.D.). Did the above phrases have equivalents in those times?