Agree with 22 September 1914 with U-9 sinking Aboukir, Hogue, Cressy which kinda signalled to the world the effectiveness
of the submarine as a maritime weapon, also agree with Prien's sinking of HMS Royal Oak on 14 October 1939.
The only one I will add is 9 November 1915, when U-35 commanded by Lothar von Arnauld de la Perière (the most successful commander
in history) sank the SS Californian avenging the Titantic!
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