Another salvo rolled out from his gun line, and another.

Damaged ships were quickly replaced on the gun line and the coastal deployment was maintained.

In the 19th century 4 to 12 pieces guns was usual as the optimum number to maneuver into the gun line.

By late 19th century the mountain artillery battery was divided into a gun line and an ammunition line.

As 1967 ended, O'Bannon was still on the gun line supporting allied ground forces.

"How far ahead of the infantry is their gun line, Campbell?"

The Major stared at the gun line again.

The ship departed Taiwan on 27 December to return to the "gun line."

He cut both gun lines out of his stump speech.

The final piece of the puzzle is the gun line itself.