Ingenious methods were employed by our submarines to entrap the enemy's ships, and especially their submarines. The following plan, for example, was successfully carried out by the Harwich submarines until the Germans by chance discovered the trick and thenceforth became more wary. The enticing of the Hun to his destruction was effected in this manner. A disreputable old fishing vessel was sent out to potter about the North Sea as if trawling for fish, thus inviting the attack of the enemy. But the rope that was trailing ostentatiously over her side was attached to no innocent trawl-beam, but to one of our submarines, which she used to tow astern of her at a depth of about sixty feet below the surface of the sea. The trawler was commanded by a naval officer, and had a crew composed partly of bluejackets and partly of trawler sailors. These trawler fishermen, by the way, eager to avenge their murdered brethren, were at first too zealous, and had to be prevented from uncovering the concealed gun which the trawler carried, so soon as an enemy was sighted, thus giving away the game. The trawler used thus to wander about the sea towing a submarine for about a fortnight at a spell; but the submarine was relieved by another submarine, always under cover of the night, every three or four days. The trawler, when she left port and when she returned to it, went alone, the submarine joining her or leaving her outside in the night. There was thus little chance of the Hun receiving information of what was doing. Whenever an enemy ship, attracted by the bait thus displayed for her benefit, made for the apparently defenceless trawler with the object of sinking her, the trawler, by means of the telephone wire which connected her with the submerged submarine, communicated to the latter the movements of the enemy. The submarine--which was enabled by a device to slip the tow-line from within--when the right moment arrived delivered her attack, and a torpedo, possibly backed up by a round or two from the trawler's now disclosed gun, finished the enemy off.