The work of the Americans really began on the Sunday which followed their arrival; by this time they had established cordial relations with Admiral Bayly and were prepared to trust themselves unreservedly in his hands. He summoned the officers on this Sunday morning and talked with them a few moments before they started for the submarine zone; the time of their departure had been definitely fixed for the next day. In the matter of ceremonial greetings the Admiral was not strong, but when it came to discussing the business in hand he was the master of a convincing eloquence. The subject of his discourse was the responsibility that lay before our men; he spoke in sharp, staccato tones, making his points with the utmost precision, using no verbal flourishes or unnecessary words--looking at our men perhaps a little fiercely, and certainly impressing them with the fact that the work which lay before them was to be no summer holiday. As soon as the destroyers passed beyond the harbour defences, the Admiral began, death constantly lay before the men until they returned. There was only one safe rule to follow; days and even weeks might go by without seeing a submarine, but the men must assume that one was constantly watching them, looking for a favourable opportunity to discharge its torpedo. "You must not relax attention for an instant, or you may lose an opportunity to destroy a submarine or give her a chance to destroy you." It was the present intention to send the American destroyers out for periods of six days, giving them two days' rest between trips, and about once a month they were to have five days in port for boiler cleaning. And now the Admiral gave some details about the practical work at sea. Beware, he said, about ramming periscopes; these were frequently mere decoys for bombs and should be shelled. In picking up survivors of torpedoed vessels the men must be careful not to stop until thoroughly convinced that there were no submarines in the neighbourhood: "You must not risk the loss of your vessel in order to save the lives of a few people."