The Clockwork Soldiers, the Toy Platoon are three portrait ghosts in Luigi's Mansion. The three are found in Area Four. The Clockwork Soldiers appear in the Clockwork Room on the third floor of the mansion.
Luigi finds the three of them standing still, not moving. When Luigi activates the three clocks found in the room, the soldiers will start attacking Luigi with their toy guns. Luigi must suck up the winding keys located on their backs with his Poltergust 3000 as the soldiers move around. After the three are sucked up, the doors will open and and allow access to the roof.