 Stationed on North Sea coastal airfields, the MFJ units often fought against Royal Naval Air Service aircraft who were stationed in similar circumstances.Sachsenberg opened his score as a fighter pilot, downing a Farman and a Sopwith 1½ Strutter on 1 May 1917.He scored again on the 12th, claiming a Sopwith Pup into the sea, and then notching a double victory on 7 June to make him an ace.