Cut off behind enemy lines in 1805, he led his troops on a remarkable but ultimately unsuccessful trek through the Alps and Italy.

[3] Charles Alain Gabriel de Rohan-Guéméné, the older brother of Louis,[6] commanded Light Infantry Battalion Nr.

14 was commanded by Conrad Reichenstein before being disbanded in 1801 and the soldiers incorporated into Archduke Franz Joseph Infantry Regiment Nr.

By 23 September, forces led by Franz Jellacic, Charles de Rohan, and Christian Wolfskehl von Reichenberg moved into Lindau, Isny im Allgäu, and Feldkirch.

[10] In early October 1805, Jellacic's forces were ordered to march north from the Vorarlberg to join the main army near Ulm.

[11] An order of battle from 8 October showed that Jellacic commanded a corps consisting of three brigades at Ulm.

[15] On 5 November 1805, Archduke John learned that Ney was in possession of the Scharnitz and Leutasch passes and there was nothing keeping him from seizing Innsbruck.

Jellacic fortified his position while asking Rohan, who retreated to Imst, to hold open his eastern escape route.

[16] On 9 November, Rohan received a peremptory order from John to retreat to Brixen, without waiting for Jellacic.

[17] On 10 November, Rohan marched from Landeck south to Nauders with 7 battalions, 10 squadrons, and 5 guns, a total of 4,400 men.

Finding on 14–15 November that Archduke John's army had abandoned the Tyrol, Rohan determined to march across northeastern Italy to Venice.

On 23 November, Rohan's brigade stormed into Bassano del Grappa routing elements of Jean Mathieu Seras' division.

Laurent de Gouvion Saint-Cyr who was besieging Venice heard about Rohan's incursion and sent Jean Reynier's division to intercept it.

Late on 23 November, Rohan reached Castelfranco Veneto where he wrecked a supply base for the French Army of Italy.

On 24 November, Rohan began marching toward Piombino Dese when he encountered Reynier's division blocking his way at 8:00 am.

[1] In the Battle of Castelfranco Veneto, Rohan's brigade began pressing back Reynier's right flank.

Hearing the noise of the battle, Saint-Cyr marched toward Castelfranco, reached a point in the rear of Rohan's brigade, and attacked.

[18][note 2] For his exploit, Rohan received the Knight's Cross of the Military Order of Maria Theresa on 28 May 1806.

[25] On the second day, IV Armeekorps was driven back and Archduke Charles, Duke of Teschen ordered a retreat.