The Anglo-Russian invasion of Holland (or Anglo-Russian expedition to Holland, or Helder Expedition) refers to the campaign of 27 August to 19 November 1799 during the War of the Second Coalition, in which an expeditionary force of British and  Russian troops invaded the North Holland peninsula in the Batavian Republic. The campaign had two strategic objectives: to neutralize the Batavian fleet and to promote an uprising by followers of the former stadtholder William V against the Batavian government. The invasion was opposed by a combined Franco-Batavian army of approximately equal strength. Tactically, the Anglo-Russian forces were successful initially, defeating the defenders in the battles of Callantsoog and the Krabbendam. However, subsequent battles went against the Anglo-Russian forces. Following a defeat at Castricum, the Duke of York, the British supreme commander, decided upon a strategic retreat to the original bridgehead in the extreme north of the peninsula. Subsequently, an agreement was negotiated with the supreme commander of the Franco-Batavian forces, General Guillaume Marie Anne Brune, that allowed the Anglo-Russian forces to evacuate this bridgehead unmolested.