Historian Charles Mullié credits Trelliard with serving under Jean Victor Marie Moreau in the blockade of Mainz. This unsuccessful operation lasted from 20 September to 13 October 1795. However, another source places the 11th Chasseurs in François Séverin Marceau-Desgraviers' Division, which was involved in the futile blockade of Ehrenbreitstein Fortress from 15 September to 17 October. He seized some redoubts and 2,000 prisoners during the Battle of Neuwied on 18 April 1797. He was appointed general of brigade on 10 September 1799. Afterward he led the cavalry in the forces occupying the Batavian Republic. On 11 December 1803 he became a member of the Légion d'Honneur and a commander of the Légion on 14 June 1804.