Posted for a 2 a/c Arty Spot, but had problems. The 2nd machine had problems after take off so went home. My lone a/c was conducting the spot for a battery of 75mm quick-fires seemed spot on. However , in 7/10ths cloud cover and at 3000 meters , we didnt see much except 2 mono planes heading for us. As we twisted and turn , My Ob got off 17 Rds of MG fire ( 3 Bursts ) No hits just a lot of noise. What save us was Archie and a few MG nests on our side chased the Huns off.