Prussian ultimatum and outbreak of the War of the Fourth Coalition
- When
- 1806
- Where
- unresolved diplomatic site; Saalburg; Schleiz
- Episodes
- 4
Prussian tensions escalated in 1806 due to French territorial adjustments and the formation of the Confederation of the Rhine. Prussia issued an ultimatum to France, leading to a declaration of war on 9 October. The conflict began with a skirmish at Saalburg and the Battle of Schleiz, where Prussian forces were defeated by French corps under Bernadotte.
Episodes
- Prussian Ultimatum
Prussia issued an ultimatum to Napoleon on 1 October 1806, deciding to contend militarily with France.
- Skirmish at Saalburg
A cavalry skirmish occurred at Saalburg on 8 October 1806, preceding the Battle of Schleiz.
- Declaration of War
Prussia declared war on France on 9 October 1806, joining a renewed coalition.
- Battle of Schleiz
French forces defeated a Prussian-Saxon division at Schleiz on 9 October 1806.
Background and detail
Background. Tensions rose after French forces ejected Swedish troops in April 1806. Napoleon formed the Confederation of the Rhine in July 1806, alarming Prussia. Prussia, irritated by earlier violations of its territory, moved toward war. King Frederick William III determined to fight Napoleon in August 1806, calling up conscripts in September.
Diplomatic Escalation. Prussia issued an ultimatum to Napoleon on 1 October 1806. This diplomatic move followed Prussia's fear of French power and plans regarding Hanover. Prussia, supported by Saxony, decided to contend militarily with the French Emperor, joining a renewed coalition against France.
Outbreak of Hostilities. Prussia declared war on France on 9 October 1806. The first military engagement occurred on 8 October with a cavalry skirmish at Saalburg. On 9 October, a Prussian division was defeated at the Battle of Schleiz by French forces under Bernadotte's command.
People involved
- Napoleon I · Emperor of the French
- Frederick William III · King of Prussia
- Jean-Baptiste Bernadotte · French Corps Commander
- Bogislav Friedrich Emanuel von Tauentzien · Prussian-Saxon Division Commander
- Jean-Baptiste Drouet, Comte d'Erlon · French Division Commander
Sources
- War of the Fourth Coalition Wikipedia, revision of 2026-09-03
- Battle of Schleiz Wikipedia, revision of 2026-08-22
- Napoleon Wikipedia, revision of 2026-09-27
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.