Fort Zeelandia had first been captured by the English in 1651 during the opening shots of the First Anglo-Dutch War and had held it until Captain Abraham Crijnssen recaptured Fort Zeelandia on 6 May 1667 in a time when the French and Dutch had total domination of the Caribbean. This changed however when Harman inflicted a heavy defeat on the French at Martinique and Crijnssen had left the Caribbean to raid the Virginia colony after which as a result the English now had complete domination of the Caribbean seas.

Harman now set forth to take advantage and attempted to capture the French and Dutch settlements in South America. After his victory at Martinique Harman refitted and resupplied at Barbados after which he ventured South then headed West along the South American coast. He captured and sacked French Cayenne which he held for two weeks before heading further West to the Dutch settlement at fort of Zeelandia.^[2]

Harman now appeared before Fort Zeelandia on the 13 October which is dominated by a heavily defended fort. Seeing that a direct assault would be unwise Harman disembarked his troops a half mile below the Fort. The English then surrounded the fort and called upon its 250-man garrison under Maurits de Rame to surrender by nightfall. The Dutch however refuse knowing that their position is well defended and supplied.^[3]

Harman after a four-day lull occasioned by a lack of winds soon lost patience and on 17 October the English launched a combined land and sea assault after a heavy bombardment. After heavy fighting in which Captain Thomas Willoughby of the ketch Portsmouth was killed as well as many others and the Dutch with fifty casualties, de Rame requested terms to Harman.^[3]

Whilst they were being finalized, some English soldiers stealthily swam around Zeelandia's defenses, and then soon swept over the fort walls; surprising the defenders and taking the fort. The English quickly sent reinforcements with row boats filled with soldiers and secured the fort, turning the recently captured guns on the Dutch outside who then see their position as untenable. De Rame then has no choice but to surrender the whole settlement.^[2][3]

Casualties were the same on both sides with around fifty killed or wounded; the imprisoned Dutch were released after being shipped to St Eustatius under terms by Harman. The English then occupied Zeelandia renaming it Fort Willoughby after the English Caribbean governor Henry Willoughby who then takes formal control of the settlement. By this stage the war had already ended but news of the capture came just too late for the treaty of Breda.^[2][3]

News arrived two weeks later from the Netherlands to announce that the colony was to be restored to the Dutch Republic according to the Treaty. Governor Willoughby refused to comply so instead decided to destroy its fortifications and turned the settlement over to the sack. Harman meanwhile reentered Barbados by 20 November, in anticipation of returning to England.^[3]

• Canny, Nicholas P. (2001). Oxford History of the British Empire: Origins of Empire: British Overseas Enterprise to the Close of the Seventeenth Century v. I (Oxford History of the British Empire). Oxford University Press. ISBN 9780199246762.
• Clowes, William Laird (2003). The Royal Navy: A History - From the Earliest Times to 1900. Vol. 1. Chatham Publishing; New ed. ISBN 978-1861760104.
• Marley, David (2008). Wars of the Americas: A Chronology of Armed Conflict in the Western Hemisphere. ISBN 978-1598841008.
• Marley, David (2005). Historic Cities of the Americas: An Illustrated Encyclopedia [Library Binding]. ABC-CLIO. ISBN 1576070271.

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