Dutch Captain: Frans Janszoon (or Jansen)

Frans Janszoon (or Jansen) served the Admiralty of Zeeland. In 1639, he took part in the campaign leading up to the Battle of the Downs. In September, he commanded the Vlissingen (34 guns and a crew of 120 men: 100 sailors and 20 soldiers). At the Battle of the Downs, he served as Jan Evertsen's flag captain. Jan Evertsen flew his Vice-Admiral's flag from Frans Janszoon's ship. In late August 1640, he was with Captains Bankert, Forant, Tjaert de Groot, and the row jacht Captain Dorrevelt in the Channel. In November 1640, he and his squadron were assisting the Great Fishery, and cruising off the Hoofden. In April 1641, he commanded the ship Vlissingen. He was part of a group of ships carrying passengers, of which he carried 44. In October 1643, he was with Tromp's squadron in a fleet of two squadrons. In December 1645, Tromp was called to the Hague. Frans Janszoon was left in charge of ten ships to guard the coast. In April 1646, he was one of three captains of large ships that were to be sent to the West Indies, under the command of the West-Indies Company, despite the lack of ships to blockade Dunkirk. He was nominally part of Tromp's fleet that in April 1646 was blockading Dunkirk. Sources:

1. Dr. M.G. De Boer, Tromp en de Armada van 1639, 1941.
2. Dr. M.G. De Boer, Tromp en de Duinkerkers, 1949.
3. Charles R. Boxer, The Journal of Maarten Harpertszoon Tromp Anno 1639, 1930.
4. Dr. F. Graefe, De Kapiteinsjaren van Maerten Harpertszoon Tromp, 1938.