Adolphus was made honorary
Colonel-in-Chief of the Hanoverian Guard Foot Regiment 1789–1803, but his military training began in 1791, when he and Ernest went to Hanover to study under the supervision of the Hanoverian commander Field Marshal
Wilhelm von Freytag. He remained on Freytag's staff during the
Flanders Campaign in 1793. His first taste of action was at
Famars on 23 May. He was wounded and captured at the
Battle of Hondschoote 6 September, but was quickly rescued. As a Hanoverian General-Major, he commanded a Hessian brigade under his paternal great-uncle, General
Johann Ludwig von Wallmoden-Gimborn in Autumn 1794, then commanded the Hanoverian Guards during the retreat through
Holland. Remaining in Germany, he commanded a brigade of the Corps of Observation from 22 October 1796 until 12 January 1798. He was made a British Army colonel in 1794, and lieutenant general on 24 August 1798. In 1800 – whilst stationed in the
Electorate of Hanover – he attended the founding of a village (part of the settlement of the
moorlands north of Bremen), which was named after him: Adolphsdorf (since 1974 a component locality of
Grasberg). During the
War of the Second Coalition against
France (1799–1802), Adolphus traveled to
Berlin in 1801, in order to prevent the impending
Prussian occupation of the Electorate.), and withdrew to England. A plan to recruit additional soldiers in Hanover to be commanded by the Prince had also failed. In 1803, Adolphus was appointed as commander-in-chief of the newly founded
King's German Legion, and in 1813, he became field marshal. George III appointed Adolphus a
Knight of the Garter on 2 June 1776, and created him
Duke of Cambridge,
Earl of Tipperary, and
Baron Culloden on 24 November 1801. The Duke served as colonel-in-chief of the
Coldstream Regiment of Foot Guards (Coldstream Guards after 1855) from September 1805, and as colonel-in-chief of the
60th (The Duke of York's Own Rifle Corps) Regiment of Foot from January 1824. After the collapse of Napoleon's empire, he was Military Governor of Hanover from 4 November 1813 – 24 October 1816, then Governor General of Hanover from 24 October 1816 – 20 June 1837 (viceroy from 22 February 1831). He was made Field Marshal 26 November 1813. While he was Viceroy, the Duke became patron of the . Regiment of the
Hanoverian Army. This regiment was stationed in
Celle, and their barracks, , were used by the
Bundeswehr until 1995. The "
March of the " is part of the Bundeswehr's traditional music repertoire. ==Marriage==