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 G... Tags: 1871-1914, Coastal defence ship, Navy, Netherlands