curtain-fire

In addition to the advancing curtain-fire immediately preceding the troops, a second screen of fire is dropped between the enemy's first and second lines, thus preventing the men in the first line from retreating and making it equally impossible for the men in the second line to get reinforcements or supplies to their comrades in the first.

Italy at War and the Allies in the West 1918

Another minute before the terrific racket of the drum-fire should become the curtain-fire, which would advance before them.

Complete Project Gutenberg John Galsworthy Works John Galsworthy 1900

Another minute before the terrific racket of the drum-fire should become the curtain-fire, which would advance before them.

Saint's Progress John Galsworthy 1900