Key Facts
- Year
- 1689
- Siege formally opened
- 16 September 1689
- Surrender date
- 12 October 1689
- Prior capture in campaign
- Kaiserswerth taken June 1689
- Conflict
- Nine Years' War (War of the Grand Alliance)
Strategic Narrative Overview
Brandenburg forces captured Kaiserswerth in June 1689, leaving Bonn as the sole major settlement in Cologne still outside Allied hands. A blockade was already in place when Allied commanders Hans Adam von Schöning and Adriaan van Flodroff seized a key fort near Bonn on 11 July. The main field army arrived on 22 July, batteries opened fire on 24 July, and a formal siege commenced on 16 September after preliminary operations.
01 / The Origins
Following Louis XIV's incursions into the Rhineland in 1688, a Grand Alliance of European powers formed to resist French hegemony. In Germany, the campaign focused on the Electorate of Cologne, a French ally. Brandenburg-Prussia and the Dutch Republic coordinated operations to strip France of its footholds along the Rhine, while Allied field armies under Waldeck faced French forces to the west and awaited reinforcements before committing to major offensive action.
03 / The Outcome
After a heavy bombardment that left much of Bonn in ruins, the defenders surrendered on 12 October 1689, completing Allied control over the Electorate of Cologne. The fall of Bonn consolidated the Rhineland campaign for the Grand Alliance and deprived France of its last significant base in the region. Bonn would face siege again in 1703 during the War of the Spanish Succession.
Belligerents & Mobilization Analysis
Side A
2 belligerents
Hans Adam von Schöning, Adriaan van Flodroff, Waldeck (overall Allied commander).
Side B
1 belligerent
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.