HistoryData
Historical ConflictIsle of Portland

Battle of Portland

The Three Days' Battle was a major but inconclusive engagement of the First Anglo-Dutch War that left control of the English Channel unresolved.

Duration & Scope

1653 ongoing

< 1 year

Key Facts

Date
18–20 February 1653 (OS)
Duration
3 days
Conflict
First Anglo-Dutch War
Also known as
Three Days' Battle

Strategic Narrative Overview

On 18 February 1653, Tromp's Dutch fleet, protecting merchant shipping, encountered Blake's Commonwealth fleet and fighting erupted across three days in the waters near Portland Bill. Both fleets suffered significant damage and losses. The battle was fiercely contested with neither side able to deliver a decisive blow, and Tromp ultimately succeeded in shepherding much of the convoy to safety, while Blake's fleet was badly mauled.

01 / The Origins

The First Anglo-Dutch War arose from commercial and naval rivalry between the Commonwealth of England and the Dutch Republic. England's Navigation Act of 1651 threatened Dutch carrying trade, prompting repeated clashes at sea. By early 1653, Dutch Admiral Maarten Tromp was escorting a large merchant convoy through the English Channel, while the English fleet under Robert Blake sought to assert dominance over those waters and disrupt Dutch commerce.

03 / The Outcome

Neither side achieved clear victory and both claimed success; the battle failed to resolve supremacy in the English Channel. Control of the Channel was ultimately settled at the Battle of the Gabbard later in 1653, enabling England to blockade the Dutch coast. The war concluded with the Battle of Scheveningen, during which Admiral Tromp was killed, and the Dutch Republic eventually signed the Treaty of Westminster in 1654.

Belligerents & Mobilization Analysis

Side A

1 belligerent

Commonwealth of England
Key Commanders

Robert Blake.

Side B

1 belligerent

Dutch Republic
Key Commanders

Maarten Tromp.

Outcome
Inconclusive; both sides claimed victory; English Channel supremacy remained unresolved until the Battle of the Gabbard

Kinetic Engagement Axis

Major engagements timeline (1653–present)Timeline of major military engagements plotted chronologically.1653present1653Battle of Portla…Inconclusive1653Battle of the Ga…Allied1653Battle of Scheve…Allied

Scroll horizontally to view full axis. Events plotted relatively.

Side A victorySide B victoryInconclusiveDecisive / turning point

Location

Map of Isle of Portland, EnglandMap of Isle of Portland, EnglandIsle of Portland, England