I have finally acknowledged that it was Jan Duijm who towed De Ruyter through the last two days of the Battle of Portland

I had thought that perhaps the name "Jan Duijm" was a mistake, and that it should have actually have been "Jacob Duijm" (or Duym). The latter's whole name was Jacob Claeszoon Duym. He served the Enkhuizen Directors and commanded the ship Vergulde Zon, which was lost at the Battle of the Gabbard. Jan Duijm seems to have been the same man as who commanded the ship Prins Willem (28 guns) at the Battle of the Sound in 1658. He served the Admiralty of Zeeland. I have seen his last name listed as "Daijm", but I have seen the handwritten Dutch from 1658, and it is clearly written "Duijm". It has been said that Jan Duijm fought in the Battle of Dungeness, but Jan Evertsen does not list him in his list of captains from December 1, 1652. The thought did occur to me that Jan Duijm could have been a lieutenant and been at Dungeness, without being listed by Jan Evertsen. In 1653, a number of lieutenants commanded ships. That was definitely the case at the Gabbard and Scheveningen. Anthonis Fappenlain was lieutenant of Tijs Tijmenszoon Peereboom's ship, the Peereboom. He commanded the ship at the Battle of Scheveningen. Bartholomeus Rietbeeck was another lieutenant who commanded a ship at the Gabbard (the Roseboom). Ulrich de Jaeger commmanded the Amsterdam Directors ship Nieuw Gideon. He had been lieutenant to Hector Bardesius in 1652. His full name was Ulrich Claeszoon de Jager (or Jaeger).