After on 18 May 1803 Britain had declared war on France, French troops invaded and occupied Bremen-Verden, arriving in Neuenwalde on June 10. In autumn of 1805, at the beginning of the War of the Third Coalition against France (1805–1806) the Imperial French occupational troops left in a campaign against the Archduchy of Austria. British, Swedish and Russian coalition forces took over. In early 1806 the French-Allied Brandenburg-Prussia captured Bremen-Verden.