Bubna is remembered for his role in the liberation of Geneva and the Léman region from fifteen years of French occupation on 29 December 1813.
[1] He ordered the creation of a Genevan Provisional Government to handle the administrative duties left vacant by the overthrown of the Department of Léman.
With the collapse of the Napoleonic Empire in the Léman Region, Bubna was the first to suggest the city and its constituent territories join the Swiss Confederation.
He was reported to have said upon entering the city, “these are the natural borders of your republic aggregated to Switzerland” while gesturing to the Lake Geneva and the Alps and Jura mountains.
The Genevan syndic Marc-August Pictet was present for this meeting and recalled: Yesterday, March 3, at two o’clock M. de Bubna received a parliamentarian, the Captain of the Engineers Couchaud, who summoned him verbally on behalf of General Dessaix (then in Carouge), to evacuate the place in three hours.
I arrived at M. de Bubna’s a few moments after this scene and found him very angry and determined not to enter unto any parley with people who treated him in this way.
French loyalist General Joseph Marie, Count Dessaix, "placed himself at the disposal of the Emperor's government when he learned of the occupation of Geneva by Bubna.
[citation needed] He held some military commands in the Kingdom of Lombardy and Venetia and led the reprisal of the Italian revolutions in 1820–21.