HNLMS Jacob van Heemskerck (1906) Jacob van Heemskerck HNLMS Jacob van Heemskerck was a coastal defence ship (or simply pantserschip in Dutch) in the Royal Netherlands Navy / Koninklijke Marine. Laid down at Rijkswerf, Amsterdam in 1905. Launched 22 September 1906 and commissioned 22 April 1908. It had a long service history, saw action in World War II as a floating battery both for Netherlands and Germany. Then rebuilt into an accommodation ship after the war and decommissioned only on 13 September 1974. There was also the second vessel of the type, Marten Harpertzoon Tromp. The two were not exactly the same though. Jacob van Heemskerck was slightly smaller and had extra two 150-mm gun install... Tags: 1871-1914, Coastal defence ship, Navy, Netherlands