1 9 4 4 , ▁near ▁F ê che - l ' É glise . ▁Before ▁esc aping ▁into ▁Switzerland , ▁he ▁was ▁engaged ▁with ▁the ▁Ma quis ▁in ▁acts ▁of ▁sab ot age ▁near ▁B elf ort ▁against ▁German ▁Army ▁units ▁under ▁the ▁command ▁of ▁Russian ▁def ector ▁General ▁And rey ▁V las ov . ▁ ▁Once ▁Sund l un ▁entered ▁Switzerland ▁he ▁turned ▁himself ▁in ▁to ▁Swiss ▁authorities ▁and ▁was ▁intern ed ▁along ▁with ▁other ▁Al lied ▁military ▁officers ▁at ▁a ▁hotel ▁in ▁Dav os . ▁Within ▁a ▁few ▁months , ▁he ▁was ▁rec ru ited ▁by ▁Allen ▁D ul les ▁to ▁work ▁out ▁of ▁the ▁U . S . ▁Emb ass y ▁in ▁Bern ▁under ▁the ▁aus p ices ▁of ▁the ▁Office ▁of ▁Str ateg ic ▁Services ▁in ▁the ▁early ▁prepar ations ▁for ▁Operation ▁Sun r ise . ▁Later ▁under ▁the ▁orders ▁of ▁D ul les , ▁he ▁re enter ed ▁France ▁to ▁act ▁as ▁a ▁bomb ard ment ▁spot ter ▁for ▁the ▁Al lied ▁invasion ▁of ▁Marse ille ▁in ▁mid - August ▁ 1 9 4 4 . ▁After ▁a ▁brief ▁service ▁as ▁a ▁pilot ▁of ▁C - 5 4 ▁Sk ym aster ▁cargo ▁plan es ▁into ▁Kar achi , ▁and ▁over ▁" The ▁H ump " ▁to ▁Kun ming ▁after ▁V E ▁Day , ▁he ▁fer ried ▁bom bers ▁( B - 2 4 ▁Liber ators ▁and ▁B - 2 9 ▁Super fort ress es ) ▁from ▁the ▁U . S . ▁main land ▁to ▁T in ian