 The deployment was necessary as Evald Hansen and Herluf Nygaard had been captured and tortured in December 1942 (Nygaard later escaped, Hansen died at Falstad).Sørli and Gjems-Onstad were set to maintain Lark, establish radio connection with London and get intelligence about the German battleship "Tirpitz", at the time located in the Trondheimsfjord.When he was training at Glen More Lodge near Aviemore, Gjems-Onstad was ordered to go to London, where he was supplied with a 20 kg radio transmitter and other equipment.