The commanding officer of the Sixtieth became convinced by three o'clock in the afternoon that all this destructive fire was preparatory to a big attack. He saw that his bridges had gone behind him, so that there was no way of escape, and he saw that the enemy was trying to cut off all means of relief and communication. He tried to get messages through, but without success. Two shells came into his battalion headquarters, killing and wounding some of the officers and men crowded in this sand-bag shelter and dug-out in the dune. He took the survivors into a tunnel bored by the miners along the seashore, and here for a time they were able to carry on. But it was almost impossible to get out to reconnoitre the situation, or to give some word of comfort or courage to men standing to arms amongst the wreckage. Flights of hostile aeroplanes were overhead, and they flew low and poured machine-gun fire at any living man who showed. Away behind they were searching for our batteries. At 6.15 all the German batteries broke into drum-fire and flung shells over the whole of our position for three-quarters of an hour without a second's pause. After all these previous barrages it reached the utmost heights of hellishness, destroying what had already been destroyed, sweeping all this wide tract of sand-dunes right away from the coast to the south of Lombartzyde with flame and smoke and steel, and reaping another harvest of death. There are many details of this action which may never be known. No man saw it from other ground, and those who were across that bank of the Yser could see very little beyond their own neighbourhood of bursting shells. But a sergeant of the Northamptons, who had an astounding escape, saw the first three waves of German marines advance with bombing parties. That was shortly after seven o'clock in the evening. They were in heavy numbers against a few scattered groups of English soldiers still left alive after a day of agony and blood. They came forward bombing in a crescent formation, one horn of the crescent trying to work round behind the flank of the Rifles on the seashore as the other tried to outflank the Northamptons on the right.