Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The action of 18 February 1639 was a naval battle of the Eighty Years' War fought off Dunkirk between a Dutch fleet under the command of Admiral Maarten Tromp and the Spanish Dunkirk Squadron under Miguel de Horna. Horna, who had orders of join with his ships Admiral Antonio de Oquendo's fleet at A Coruña, escorted at the same time a transport convoy carrying 2,000 Walloon soldiers to Spain, where they were needed. The attempt to exit Dunkirk was done at the sight of the Dutch blockading squadron of Maarten Tromp.