Key Facts
- Duration
- 105 days (18 April – 1 August 1689)
- First attempted breach
- 7 December 1688, repelled by 13 apprentices
- Jacobite commander
- King James II appeared personally before the walls
- Siege broken by
- Supply ships breaking through the boom
- Annual commemoration
- Observed yearly by the Protestant community
Strategic Narrative Overview
The formal siege began on 18 April 1689 when James II himself led an Irish army, stiffened by Jacobite and French officers, to the walls and demanded surrender. The garrison refused. Jacobite attempts to storm the walls failed, leading the besiegers to adopt a strategy of starvation. A boom was stretched across the River Foyle to cut off resupply. The town endured severe privation over 105 days while holding out.
01 / The Origins
Following the Glorious Revolution in England, Ireland became a theatre of conflict between the deposed Catholic King James II and the Protestant William of Orange. Derry, a Protestant-held town, became a flashpoint when Jacobite forces attempted to garrison it in December 1688. Thirteen apprentices famously shut the gates against the Jacobite troops, an act of defiance that set the stage for the full siege months later.
03 / The Outcome
The siege ended on 1 August 1689 when relief ships broke through the boom on the River Foyle, resupplying the starving garrison. Jacobite forces abandoned the siege and withdrew. The successful defence boosted the Williamite cause in Ireland and denied James II control of a strategically important northern stronghold early in the campaign. The event became a defining symbol for Ulster Protestant identity.
Belligerents & Mobilization Analysis
Side A
1 belligerent
James II.
Side B
1 belligerent
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.