field of fire

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The area that can be reached by ammunition fired from a gun or a group of guns.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The area that a projectile weapon (or group of weapons) can reach from a given position.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the area that a weapon or group of weapons can cover effectively with gun fire from a given position