mine field gap

mine field gap

[′mīn ¦fēld ‚gap]
(ordnance)
A portion of a mine field in which no mines have been laid, of specified width to enable a friendly force to pass through the mine field in tactical formation; seldom less than 100 yards (91 meters) wide.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.