In France, the efforts of the French Resistance were significant enough to make a significant impact on the outcome of the war. They dismantled tank treads, put sand in the grease of vehicles, and stole ball bearings.
It’s the enemy’s oldest and favorite tactic. He sabotaged Eden. He infiltrated the children of Israel by seduction when Balaak’s army couldn’t defeat them in a head on confrontation. In the early days, his tactic is to sow tares among the wheat making it clear that “An enemy has done this.” He is trying to derail the carriage of the troop transport off course. In WW2, my grandfather who served in the 101st airborne was delayed from crossing the Atlantic, but the ship he was originally scheduled to be on was sunk by a German U-boat.