What the RFC called “Estourmel” was actually the airfield of Jasta 5 at Boistrancourt. Quoting Glen K Merrill’s history of Jasta 5: “No 3 Squadron with their Sopwith Camels were targeted for ‘Estourmel’, in reality Jasta 5 at Boistrancourt…They sent nine Camels against ‘Estourmel,’ Carnieres and Caudry. They lost eight of them, one in air combat, some from anti-aircraft, but most to the weather; three dead and two made POW, the other three pilots surviving and returning, although their aircraft did not…” Oblt. Richard Flashar wrote an evocative account of this day’s events. The heavy fog, mist, and rain had discouraged Flashar from ordering his pilots aloft. However, under orders, and having sighted some dark shapes of RFC planes overhead in the mist, Flashar ordered four pilots (including himself) into the air.
Josef Mai got lucky and blundered on to Camel B5159 and shot it down, killing 2/Lt G W Hall.
On this first day of the Cambrai battle, Jasta 5 was the only German fighter squadron in the sector.