▁instructions , ▁Haus ho fer ▁wrote ▁to ▁Hamilton ▁in ▁September ▁ 1 9 4 0 , ▁but ▁the ▁letter ▁was ▁intercept ed ▁by ▁M I 5 ▁and ▁Hamilton ▁did ▁not ▁see ▁it ▁until ▁March ▁ 1 9 4 1 . ▁Hamilton ▁was ▁chosen ▁in ▁the ▁mistaken ▁belief ▁that ▁he ▁was ▁one ▁of ▁the ▁leaders ▁of ▁an ▁opposition ▁party ▁opposed ▁to ▁war ▁with ▁Germany , ▁and ▁because ▁he ▁was ▁a ▁friend ▁of ▁Haus ho fer . ▁ ▁A ▁letter ▁H ess ▁wrote ▁to ▁his ▁wife ▁dated ▁ 4 ▁November ▁ 1 9 4 0 ▁shows ▁that ▁in ▁spite ▁of ▁not ▁receiving ▁a ▁reply ▁from ▁Hamilton , ▁he ▁intended ▁to ▁proceed ▁with ▁his ▁plan . ▁He ▁began ▁training ▁on ▁the ▁Mess ersch mitt ▁B f ▁ 1 1 0 , ▁a ▁two - se ater ▁tw in - engine ▁aircraft , ▁in ▁October ▁ 1 9 4 0 ▁under ▁instruct or ▁Wilhelm ▁St ör , ▁the ▁chief ▁test ▁pilot ▁at ▁Mess ersch mitt . ▁He ▁continued ▁to ▁pract ise , ▁including ▁logging ▁many ▁cross - country ▁fl ights , ▁and ▁found ▁a ▁specific ▁aircraft ▁that ▁handled ▁well — a ▁B f ▁ 1 1 0 E - 1 / N — which ▁was ▁from ▁then ▁on ▁held ▁in ▁reserve ▁for ▁his ▁personal ▁use . ▁He ▁asked ▁for ▁a ▁radio ▁comp ass , ▁modifications ▁to ▁the ▁o xygen ▁delivery ▁system , ▁and ▁large ▁long - range ▁fuel ▁t anks ▁to ▁be ▁installed ▁on ▁this ▁plane , ▁and ▁these ▁requests ▁were ▁granted ▁by ▁March ▁ 1 9