A small Dutch warship Neptunus in 1629

In the first half of the 17th Century, the Dutch used many small warships, mostly on the rivers. One of these in 1629 was the Rotterdam ship Neptunus, built in 1623. Captain Cornelis Arentsz de Jonge commanded the Neptunus. The Neptunus was 30 Rotterdam lasts, or by my theory, 40 lasts when measured in Amsterdam feet. The crew consisted of 31 sailors and the ship was armed with 6-iron 4pdr, 2-iron 2-1/2pdr, and 10 steenstukken. There were 20 chambers, two for each of the steenstukken (literally "stone guns", which are usually said to be swivel guns). Two chambers for a "stone gun" allowed one to be in the gun and one to be loaded, providing a higher rate of fire. The steenstukken were iron breech loading guns. The Neptunus was at Batenborgh.