The Sigfrid (formerly the Esteburg) was a German patrol vessel of 496 tons displacement launched between 1912 and 1921 as a trawler, and acquired by the German navy for military use in 1937. She had a top speed of 10 knots, carried a complement of 38 and was armed with one 3.5 inch gun and three 1 pdr anti-aircraft guns. Research Sigfrid
 
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