The 2nd & 3rd regiments and the 2nd light battalion were part of the garrison of Dresden which surrendered when that town fell. During 1813 most of the old units were hastily re-raised, the 1st line infantry regiment formed part of the garrison of Danzig and surrendered on 29th November 1814. Following the disastrous retreat from Russia less than 1,000 Westfalian survivors gathered at Thorn during January 1813. In 1812 a new two battalion garde infantry regiment (fusiliers) was raised, together with the 9th line regiment, the 4th light battalion and the 2nd chevau-leger regiment.

In 1810 the 1st and 2nd hussar regiments were raised, in 1811 the 3rd light infantry battalion and two line infantry regiments (2nd and 7th) added a third field battalion. In July of 1808 the 2nd cuirassier, 7th and 8th Line infantry regiments and the 2nd light infantry battalion were raised. The line consisted of an elite jäger-carabinier battalion (normally attached to the Garde), six line infantry regiments each of two battalions, one light battalion, one cuirassier regiment, one chevau-leger regiment plus national guards and veterans units.

The Westfalian army created to meet this requirement was closely modelled on that of France and by the end of 1808 comprised the royal garde grenadier and jäger battalions, the chevau-leger regiment and a garde-du-corps squadron. As such it was obliged to provide a 25,000 strong contingent to the Grande Armee in the event of war. Westfalia was entered as a charter member of the newly formed Confederation of the Rhine. The new Kingdom was composed of parts of Hannover, Brunswick, Saxony and most of Hesse-Kassel. The Kingdom of Westfalia was created by Napoleon in December 1807 following the treaty of Tilsit.

Confederation of the rhine flag