“Look out!” said the lanky man. “Germans!”

It was certain that two birds hovering over the Grande Place were hostile things, because suddenly white puffballs burst all round them, as the shrapnel of our own guns scattered about them. But they flew round steadily in a half-circle until they were poised above our heads.

It was time to seek cover, which was not easy to find just there, where masses of stonework were piled high. At any moment things might drop. I ducked my head behind a curtain of bricks as I heard a shrill “coo-ee!” from a shell. It burst close with a scatter, and a tin cup was flung against a bit of wall close to where the lanky man sat in a shell-hole. He picked it up and said, “Queer!” and then smelled it, and said “Queer!” again. It was not an ordinary bomb. It had held some poisonous liquid from a German chemist’s shop. Other bombs were dropping round as the two hostile airmen circled overhead, untouched still by the following shell-bursts. Then they passed toward their own lines, and my friend in the shell-hole called to me and said, “Let’s be going.”