Which British expeditionary campaign in 1809 failed in the Netherlands?

Which British expeditionary campaign in 1809 failed in the Netherlands? The Walcheren Campaign. It was Britain’s unsuccessful 1809 expedition to the Kingdom of Holland during the War of the Fifth Coalition.

The British expedition landed in July with the aim of seizing the Scheldt estuary, destroying French naval facilities and threatening Antwerp. British troops captured Walcheren and South Beveland, but the strategic situation had already worsened: Austria had been defeated at Wagram before the operation got fully underway.

The campaign became notorious for disease. The low-lying, marshy terrain produced widespread cases of what British soldiers called “Walcheren fever,” probably a combination of malaria and other infections. Thousands became sick, severely reducing the expedition’s effectiveness even though major fighting had largely ended.

The British evacuated most of Walcheren by the end of 1809. “Flanders Campaign” can refer to earlier British operations in the Low Countries, while Gallipoli belongs to the First World War and Sicily was a separate Mediterranean campaign. The 1809 failure is specifically the Walcheren Campaign.