1.6 Landing-cross and two aeroplanes close to Valenciennes-Cambrai road 1-1/2 miles from Valenciennes. Aircraft gun fires on us from landing-place. Mechanical transport halted on road. Squadron of cavalry in bivouac. 1.15 In clouds--making very little progress. 1.30 N. of Cambrai. Descend to 3,000 out of clouds. Troops marching S.W. down main road. 1.35 Cambrai in flames and occupied by Germans. 1.40 W. of Cambrai. Under heavy infantry fire. Engine put out of action by bullet. Glide two miles farther W. clear of enemy, and land. Burn machine and join French Cavalry retreating towards Arras. Commandeer two bicycles and go to Gouzeaucourt where we get car and report to H.Q. 12th Brigade near Le Catelet. Get back to St. Quentin about 11.30 p.m. and report to General Smith-Dorrien. (_Signed_) L. B. BOYD-MOSS, Major. The machine, it will be seen, dropped a bomb on a park of transport vehicles, was fired at by howitzers, and was brought down by heavy infantry fire. A more dreaded enemy here makes an early appearance--the prevailing westerly wind. This wind was the heaviest trial for pilots during years on the western front; it made it easy to get at the enemy and difficult to get away from him; the road to safety always, while the west wind was blowing, lay uphill.