Napoleonic troops under lieutenant-general Édouard Adolphe Casimir…
July
1803 CE
Napoleonic troops under lieutenant-general Édouard Adolphe Casimir Joseph Mortier had occupied the electorate of Brunswick-Lüneburg's capital at Hanover on June 4 1803, after which the remaining Hanoverian troops had withdrawn to the north bank of the Elbe, into the Duchy of Saxe-Lauenburg, but were soon forced to surrender.
The convention of Artlenburg leads to the French occupation of Hanover (which had been ruled by the British king) on July 5, 1803.