"they offered to instruct her in silent killing"

 From 1943 the SOE was led by Brigadier Colin Gubbin... He was a great believer in guerilla movements and wanted to ensure that agents were well trained in arms and explosives and had a complete idea of the ethnology of the place they would be working in. He secured remote country houses in the Highlands of Scotland to train his agents in arms.  

from Spy Princess – The Life of Noor Inyat Khan by Shrabani Basu