Mahaddie waxaa loo xilsaaray 24 July 1944 markii loo magacaabay sarkaalka ugu sarreeya ee RAF Warboys, garoonka diyaaradaha ee uu ku yaalay kooxda tababarka ee Pathfinder Force. Waxa uu amarkii ka qaatay Group Captain J. H. Searby, duuliye oo Mahaddie horey ugu soo qortay Pathfinder Force, oo caan ku ahaa inuu ahaa Master Bomber duulaankii Peenemünde
Waxaad Qeybta ayaa tababartay shaqaalaha diyaaradaha ee Avro Lancaster iyo De Haviland Mosquito. Mahaddie waxaa mar kale lagu xusay waraaqaha 1 Janaayo 1945. Duullimaadkii ugu dambeeyay ee uu duulay wuxuu ahaa markii uu hogaaminayay duulimaad 60 ah oo ah Lancasters si dib loogu celiyo RAF POWs oo lagu qabtay Lübeck.