|Part of the War of the Fifth Coalition|
| First French Empire
Kingdom of Holland
|Commanders and leaders|
| Jean-Baptiste Bernadotte
Louis Claude Monnet de Lorbeau
| Lord Chatham
Sir Richard Strachan
|Casualties and losses|
|4,000 dead, wounded or captured
including 1st battalion, Irish legion
|4,000+ dead, wounded or captured
The Walcheren Campaign was an unsuccessful British expedition to the Netherlands in 1809 intended to open another front in the Austrian Empire's struggle with France during the War of the Fifth Coalition. Around 40,000 soldiers, 15,000 horses together with field artillery and two siege trains crossed the North Sea and landed at Walcheren on 30 July. This was the largest British expedition of that year, larger than the army serving in the Peninsular War in Portugal. The Walcheren Campaign involved little fighting, but heavy losses from the sickness popularly dubbed "Walcheren Fever". Although more than 4,000 British troops died during the expedition, only died 106 in combat; the survivors withdrew on 9 December.
In July 1809, the British decided to seal the mouth of the Scheldt to prevent the port of Antwerp being used as a base against them. The primary aim of the campaign was to destroy the French fleet thought to be in Flushing whilst providing a diversion for the hard-pressed Austrians. However, the Battle of Wagram had already occurred before the start of the campaign and the Austrians had effectively already lost the war.
John Pitt, 2nd Earl of Chatham commanded the army, whilst Sir Richard Strachan commanded the navy. As a first move, the British seized the swampy island of Walcheren at the mouth of river Scheldt, as well as South Beveland island, both in the present-day Netherlands. The British troops soon began to suffer from malaria; within a month of seizing the island, they had over 8,000 fever cases. The medical provisions for the expedition proved inadequate despite reports that an occupying French force had lost 80% of its numbers a few years earlier, also due to disease. Once it had been decided to garrison Walcheren Island in Sepember 1809, Pitt was replaced by Lieutenant-general Eyre Coote who in October was replaced by Lieutenant-general George Don.
The French forces were commanded by Jean-Baptiste Bernadotte, who had just been stripped of his command after disobeying orders at Wagram. Dismissed from Napoleon's Grande Armée, Bernadotte returned to Paris and was sent to defend the Netherlands by the council of ministers. He led the French forces competently and although the British captured Flushing, after a ferocious bombardment, and the surrounding towns on 15 August, he had already ordered the French fleet to Antwerp and heavily reinforced the city. With the main objective for the British out of reach, the expedition was called off in early September. Around 12,000 troops stayed on Walcheren, but by October only 5,500 remained fit for duty.
In all, the British government spent almost £8 million on the campaign. Along with the 4,000 men that had died during the campaign, almost 12,000 were still ill by February 1810 and many others remained permanently weakened. Those sent to the Peninsular War to join Wellington's army caused a permanent doubling of the sick lists there.
Order of battle
British Expeditionary Force to Walcheren
- Commander-in-Chief: General Lord Chatham
- Second-in-Command: Lieutenant General Sir Eyre Coote
- Chief-of-Staff: Sir Robert Brownrigg
- Royal Artillery
- 1st Division
- 2nd Division
- Lieutenant General the Marquess of Huntly
- Major General Dyott’s Brigade (1/6th; 1/50th; 1/91st)
- Brigadier General Montresor’s Brigade (1/9th; 1/38th; 1/42nd)
- Lieutenant General the Marquess of Huntly
- 3rd Division
- 4th Division
- Light Division
- Light Troops, Attached to the Left Wing of the Army
- Brigadier General Baron de Rottenberg’s Brigade (68th, 1/71st, 85th, 2 Coys., 2/95th)
- Brigadier General Mahon (9th Light Dragoons)
A fleet of around 40 vessels, including sixteen 74 gun warships of the first class, participated under the overall command of Rear Admiral James Bissett. A number of smaller vessels including customs-house and excise cutters were also involved, as was a packet ship. The City of London, Loyal Greenwich, and Royal Harbour River Fencibles also contributed men to the expedition.
The 1st battalion of the Irish Legion (raised by the French for an invasion of Ireland that never happened) was stationed in Flushing during the assault and received its baptism of fire there. It fought a rear guard action for several days but the battalion was almost completely captured. The Legion's brass band followed by the Irish battalion led the surrendered French garrison out of the town. However, a small party of Irishmen escaped and went into hiding with the battalion's cherished imperial eagle, and after a few days they crossed the Scheldt River and escaped. Commandant Lawless was presented to Napoleon and he together with Captain O'Reilly received the Légion d'honneur in gratitude.
- Burnham, Bob; McGuigan, Ron (2010). The British Army Against Napoleon: Facts, Lists and Trivia, 1805-1815. Frontline Books. p. 42. ISBN 978-1-84832-562-3.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Brigade here refers to half-battery
- Brown, Steve (May 2010). "British Royal Horse Artillery Companies and the Men Who Led Them – 1793 To 1815". The Napoleon Series. Retrieved 17 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- The London Gazette: . 26 September 1812.