On 22 August 1914, the first British aircraft was lost to German fire. The crew—pilot Second Lieutenant Vincent Waterfall and observer Lt. Charles George Gordon Bayly, of 5 Squadron—flying an Avro 504 over Belgium, were killed by infantry fire. Also on 22 August 1914, Captain L E O Charlton (observer) and his pilot, Lieutenant Vivian Hugh Nicholas Wadham, made the crucial observation of the 1st German Army's approach towards the flank of the British Expeditionary Force. This allowed the BEF Commander-in-Chief Field Marshal Sir John French to realign his front and save his army around Mons.