The Germans have a cavalry screen behind their rear-guards. They were seen yesterday north of Bapaume and southwards beyond Roye. And some of them were chased by a British airman at a place called Ennemain. He swooped low like an albatross, and brought a man off his horse by a machine-gun bullet. Others stampeded from this terrible bird. This morning our troops were through Eterpigny beyond Barleux, and found the villages of Misery and Marchelepot. There was some fighting last night and this morning in the neighbourhood of Péronne. The enemy had snipers and machine-gunners about, and kept some of their batteries back until the last possible moment, flinging 5·9's and smaller shells over our side of the lines, and firing heavily until about ten o'clock. Then the gun-fire ceased, and there was not a shot. His guns were going back along the dark roads, his rear-guards moved away, leaving behind them their great defensive works of the Bapaume Ridge, and burning villages. * * * * * MARCH 19 Refusing to give battle, the enemy has retired still farther over open country east of Bapaume, and our cavalry patrols are in touch with his mounted rear-guards. The exact location is vague, as the movement continues, and our cavalry is in small units, moving cautiously between a large number of burning villages, which are everywhere alight. Small parties of the enemy were encountered last night in the open near Ytres and Berthincourt, and some snipers in an omnibus opened fire upon a cavalry patrol, and were scattered by an aeroplane which swooped low, sweeping them with machine-gun bullets. South of the Somme our cavalry got in touch with German cavalry at Rouy and with German cyclists at Potte. All the bridges have been destroyed to cover the enemy's retreat, as at Rouy and Breuil, and all the wells have been filled with filth and rubbish.