Tripwire

Typically, a wire or cord is attached to a device for detecting or reacting to physical movement.

Such tripwires may be attached to one or more mines⁠ — especially fragmentation or bounding mines⁠ — in order to increase the area where triggering may occur.

Its use in detecting tripwires was first discovered in 1993 by Sergeant First Class David B. Chandler, Chief Instructor of the United States Army's Sapper Leader Course.

That year it was introduced to students attending the course, and it was later used in combat for this purpose by U.S. troops in the Iraq War.

[1][2][3] Another detection method is the use of green line lasers to illuminate and thus expose trip and command wires.