Thugot's chancellorship did not survive the Austrian defeats by the French at the battles of Marengo and Hohenlinden in 1800 and he was replaced by Johan Ludwig Joseph Cobenzl (1800–1805), his predecessor's cousin, but who in turn was dismissed following the Austrian defeat at Austerlitz in 1805.
After the French returned, it was rebuilt to celebrate the Battle of Marengo but was then again demolished.
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This achievement is described by Mathieu Dumas, his chief of staff, and is as noteworthy as Bonaparte's passage of the St Bernard before the Battle of Marengo, although MacDonald did not fight a battle.
At the age of sixteen, he joined the staff command of General Clarck, upon the departure of Napoleon Bonaparte, then First Consul, for the Marengo campaign, where French forces defeated the Austrian army on 14 June 1800, forcing them to withdraw from Italy west of Ticino.