Sybil Kathigasu, a Eurasian nurse and member of the Perak resistance, was tortured after the Japanese "Kenpeitai" military police discovered a clandestine shortwave radio set in her home. John Davis, an officer of the British commando Force 136, part of the Special Operations Executive (SOE), trained local guerrillas prior to the Japanese invasion at the 101 Special Training School in Singapore, where he sought Chinese recruits for their commando teams. Under the codename Operation Gustavus, Davis and five Chinese agents landed on the Perak coast north of Pangkor Island on 24 May 1943. They established a base camp in the Segari Hills, from which they moved to the plains to set up an intelligence network in the state. In September 1943, they met and agreed to co-operate with the MPAJA,