I am walking up and down the line of sentries, under the dark boughs of the poplars. In the flooded ditch outside the rats are paddling about, making as much noise as otters. As the yellow dawn comes up behind us, the Andalusian sentry, muffled in his cloak, begins singing. Across no-man’s-land, a hundred or two hundred yards away, you can hear the Fascist sentry also singing.