Author: Karl Smallwood / Source: Today I Found Out

In the opening days of WW1, Unterseeboots, better known simply as U-boats, proved to be a potent and constant threat to Allied ships, with one U-boat identified as SM U-9 infamously killing nearly 1,500 British sailors in less than an hour by sinking three armoured British cruisers on September 22, 1914.
That same U-boat would go on to sink over a dozen British ships during its naval career, with targets ranging from small fishing boats caught in open water to the Edgar-class protected cruiser, HMS Hawke.The reason for the U-boat success in the early going of the war was, in part, due to the fact that when they were submerged they were undetectable by technology of the day.
Another factor that played into German hands is that the Allies, especially the British, consistently downplayed the danger posed by submarines and their value in combat. In fact, at first British Naval brass simply refused to acknowledge that U-boats were sinking ships. For example, the aforementioned actions of U-boat SM U-9 were initially attributed to mines.
In short, British Naval officers had little faith in the potential of submarines and wrote them off as a mere fascination that had no real potential in combat beyond novelty. Thus, they did little at first to try to come up with viable ways to combat them.
Things got real, however, when U-boats like SM U-9 began targeting British supply ships, almost bringing the country to its knees when it found itself unable to secure even basic provisions for its citizens and factories.
A solution was needed. But how to take out a target that is capable of disappearing at will?
It was quickly noted that one weakness of the U-boat was that it needed to use its periscope to mark its target before attacking. This presented a brief, but exploitable window of opportunity to attack the craft in some way. But how?
Up until the introduction of depth charges in 1916, while mines and large nets were utilized to protect certain areas with some minor effect, the conclusion of the Admiralty Submarine Attack Committee was that the best thing to do was simply for ships to either run away from or try to ram the U-boats when the periscope was spotted.
Naturally, beyond risking damage to your own vessel, getting closer to the thing that’s about to shoot you with an otherwise somewhat…
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