Although Dunkirk on this particular August night seemed uncannily quiet, the hour was not late. By Greenwich time it was but a few minutes past nine, and two bells had only just sounded through the many and diverse ships lying in tiers alongside the quays. So warm were the soft summer zephyrs, which scarcely stirred the surface of the water, that on the decks of many of these war-worn sweepers and patrols men lay stretched out under the sky in the sound sleep of exhaustion, while on the quays and at other points in the half-wrecked town steel-helmeted French sentries kept watch. Of the British naval forces based on this little French seaport few were ashore, as, without special permission, both officers and men had to remain on their ships after sunset, and those not playing cards or reading in the cabins were lounging and smoking on deck. Blot out of the view the ruined houses, the shell-holes in the streets, the guns, the dug-outs and the sentries, and few scenes more unlike the popular conception of a big war base, with the enemy only a few miles distant, can be imagined. But Dunkirk in that year of grace, 1917, did not always wear so peaceful a garb. There were frequent periods when the shells whistled over or on to the town, when the earth trembled from the concussion of high explosives, when buildings collapsed or went heavenwards in clouds of dust, when the streets were illumined with the yellow flash of picric acid, or were filled with clouds of poisoned gas, when ambulances clattered over the cobblestones, trains of wounded rolled in from the firing line and the killed and maimed were landed from the sea. The first indication of the change from calm to storm came at the early hour of 10 P.M., when the air raid warning sounded throughout the town. On the quayside all was ordered haste. Mooring ropes were cast off with a minimum of shouting, and the larger ships moved slowly down the harbour towards the open sea. The few small vessels left seemed to crouch under the dock walls. Sentries left their posts to take shelter in the great dug-outs, constructed of heavy timbers and sand-bags. These were situated at convenient points throughout the battered little town. In the houses some people descended to the cellars, but many remained wherever they happened to be, while in the cabins of the few ships which remained in harbour the games, the reading, the letter-writing and, in a few cases, even the sleeping went on undisturbed.