As part of the campaign he led against the Hukbalahap, Edward Lansdale tried to convince the Philippine insurgents that they were being stalked by vampires. Lifted from comments here, and apparently there’s something in it:
After a few days, he had his men set up an ambush along a trail the Huks used regularly. When a patrol came by, necessarily in single file along a narrow mountainside, they stayed hidden and let them pass. All but one. They grabbed the poor sucker at the tail end of the line. After killing him, they punctured two neat little holes in his neck, then hung him upside down and let all the blood drain from his body. Then the body went back on the trail for the Huks to find when they came back looking for their comrade.
The Huk unit that had previously been so difficult to displace vanished into thin air the next day, leaving the mountain to the government troops.
I was reminded of the original Quiet American a few days back by this piece in the Indy about the diplomats expelled from Afghanistan just after Christmas. It looks like they were trying to set up a Third Force, a la Lansdale and the Cao Dai (British branch here). No wonder Karzai was livid.