The time passed slowly, as it generally did on patrol when nothing exciting was afoot, but a few minutes before the awaited eight bells the officer on duty snatched up the binoculars, and almost simultaneously the look-out gave a warning shout which caused the attention of everyone on deck to suddenly become strained.
Away to port, less than half-a-mile distant, the thin grey tube of a periscope could be seen planing through the waves, with a fringe of white foam blowing from its base. There was a hoarse cry down the fo'c'sle hatch for "All hands on deck!" The telegraph tinkled for "Full ahead!" A signal was made to the ships astern for concerted action. The gun was manned, and the leading trawler, now cleared for action, headed towards her under-water opponent.
The other two vessels of the unit put on speed and spread out until all three were line-abreast and about two cables apart. In this formation the chase was maintained for some twenty minutes, when a second submarine appeared above the surface away to starboard. She appeared to be a large vessel and would probably have turned the scale at 1000 tons.
It was at this early stage in the action that the mistake was made. The leading trawler immediately opened fire, but the range was considerable and the shells fell short. Signalling to the other two trawlers to continue the chase of the first submarine sighted, she headed straight for the largest of the two hostile craft to engage her at close range.
While this was in progress the first submarine came to the surface and proved to be also a larger craft than had been anticipated. The two trawlers chasing her immediately opened fire, but her superior surface speed soon placed her out of range of the comparatively small guns then carried by the trawler patrols.
Now came the surprise. Almost simultaneously the two submarines opened fire from heavy guns. The shells at first fell wide, but in a moment the British officers realised that they were outranged, for whereas their shells were falling short, those from the enemy whistled over their heads and ploughed up columns of white water over a cable's length astern.
To increase speed and so reduce the range became imperative, and the steam-pressure in the trawlers' boilers was raised to bursting point by the simple expedient of screwing down the safety valve. For some minutes it looked as though the effort would be successful, and then the range slowly increased again and "short" after "short" was registered by the gunners.
At this psychological moment a German shell carried away the funnel of the leading trawler and smothered her decks with smoke. When a temporary shield had been rigged it was observed that one of the other patrol ships had been crippled by a direct hit and was in a sinking condition.
It now became evident that the superior speed and gun-power of the submarines enabled them to keep out of range of the trawlers' weapons and to ply their long-range fire with telling effect.
The officer in command of the patrol at once realised the mistake he had made when opening the action, in betraying the power of his own guns before he was sufficiently close to the enemy to ensure hits, and he cursed this want of foresight which looked like costing the life of the flotilla. Given one direct hit on each of his two powerful opponents and they would in all probability have been put out of action, but instead he had only the mortification of seeing every shell fired fall short, while his own vessels were being battered to pieces by the long-range guns of an enemy with whom he could not close.