The spy class in Team Fortress 2 employs this device on the engineer's buildings to slowly disable and destroy the structure. Planting the sapper requires the spy to be right in front of the structure, when planted, the spy does not lose his disguise and is able to sap as many structures as he can spot. However, the engineer class is able to destroy any planted sappers with his melee weapon; the wrench by swiping at the sapper.
The sapper is a valued tool of the spy and to the team, as a common strategy is to mass sap the sentries and allow for the offensive classes to charge through to destroy the buildings before the engineer has a chance to recover the structure.
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