SM U-9
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SM U-9 was a German Type U 9 U-boat. She was one of 329 submarines serving in the Imperial German Navy, and engaged in commerce raiding (Handelskrieg) during World War I.
U-9 ready for patrol.
Illustration by Hans Bohrdt depicting the sinking of HMS Cressy, HMS Hogue and HMS Aboukir by U-9 on 22 September 1914 off the Dutch coast.
The men of U-9.
Propaganda postcard depicting victories of U-9.
U-boat
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U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars. The term is an anglicised version of the German word U-Boot, a shortening of Unterseeboot, though the German term refers to any submarine. Austro-Hungarian Navy submarines were also known as U-boats.
U-995, a typical VIIC/41 U-boat on display at the Laboe Naval Memorial
The first German submarine, the SM U-1.
The German submarine U-14, showing the kerosene vapour trail.
Sea mines are loaded in a UC coastal submarine in the harbour of Zeebrugge