In 1632 he commanded the Samson and the Vlissingen, two ships belonging to a fleet of 12 privateers owned by the brothers Lampsins.
In December 1666, Crijnssen received the command over a squadron, composed of the frigates Zeelandia, West-Cappelle and Zeeridder, and four smaller ships, including Prins te Paard.
The plantation owners could remain and were granted equal citizenship, if they swore alliance to the States of Zeeland.
On 17 April Crijnssen had already left to liberated the Dutch colonies of Berbice, Essequibo and Pomeroon, but at arrival the learned that the English had already been expelled.
After this battle, Crijnssen sailed to Virginia, where he surprised in the mouth of the James River an English commercial fleet, ready to cross the ocean with a cargo of tobacco.
During the Battle of The James River (1667) he captured the English escort warship, spread his men over 11 merchant ships, and burned the rest.