On September 22, 1914, the German submarine U-9, captained by Otto Weddigen, engaged several British cruisers in a decisive encounter. The British vessels, HMS Aboukir, HMS Cressy, and HMS Hogue, were patrolling the North Sea when they were struck by torpedoes fired from the U-boat. This innovative tactic of submarine warfare showcased the shift in military strategies during World War I, highlighting the potential of undersea warfare. The operation was remarkably efficient, with all three ships being sunk within a mere seventy minutes, resulting in extensive loss of life. The majority of the crew members aboard the cruisers were not able to escape or were unable to be rescued, contributing to a staggering Nearly 1,500 sailors perished in this incident.

The event had significant implications for naval operations. The British Royal Navy faced criticism for its reliance on large surface ships, which proved vulnerable to submarine attacks. In contrast, the German Navy recognized the effectiveness of U-boats, leading to a reevaluation of naval strategy across multiple countries involved in the war. This incident, among others, prompted the Allies to bolster their anti-submarine warfare measures, including the development of depth charges and improved sonar technology. The sinking of the cruisers not only marked a brutal lesson for British naval forces but heralded a shift in naval engagements that would be seen throughout the war.

The impact of this attack extended beyond immediate military considerations. The psychological effects on the British public and military command were profound. The loss of life was keenly felt, stirring public sentiment and prompting debates over naval policies. Consequently, the event also influenced political discussions regarding wartime strategy, resource distribution, and the need for more advanced technology in warfare. The results of the attack by U-9 illustrated the beginning of a new era in naval history, with submarines emerging as formidable assets in global conflicts.