Key Facts
- Duration
- ~11 months (22 Jan – 11 Dec 1807)
- Garrison commander
- General Wilhelm René de l'Homme de Courbière
- Polish units involved
- 2nd, 4th, and 7th Infantry Regiments
- Outcome for fortress
- Remained Prussian; French abandoned siege
- Conflict context
- War of the Fourth Coalition, Napoleonic Wars
Strategic Narrative Overview
Beginning on 22 January 1807, French imperial forces and allied Polish units from the 2nd, 4th, and 7th Infantry Regiments blockaded and besieged the fortress. General de Courbière commanded the Prussian garrison and successfully resisted all pressure for nearly eleven months. The siege continued even after the Peace of Tilsit in July 1807 formally ended hostilities between France and Prussia, as the fortress's status remained unresolved pending border negotiations.
01 / The Origins
The siege of Graudenz arose from the War of the Fourth Coalition, in which Napoleonic France and its allies campaigned against Prussia and Russia. French forces swept through Prussia in 1806–1807, seizing most Prussian territory. The fortress of Graudenz, situated in West Prussia within the Prussian Partition of Poland, was strategically significant and became a target for French and allied forces seeking to consolidate control over the region.
03 / The Outcome
The French ultimately abandoned the siege on 11 December 1807, once the borders between Prussia and the newly created Duchy of Warsaw were formally defined, leaving Graudenz within Prussian territory. The fortress remained a Prussian possession for over a century, until Poland regained independence following World War I, at which point Grudziądz became part of the restored Polish state.
Belligerents & Mobilization Analysis
Side A
2 belligerents
Side B
1 belligerent
Wilhelm René de l'Homme de Courbière.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.