With the Army of the Rhine, Delmas commanded the 7th Division of the right wing of the army, serving under Lecourbe. For a short time he was in charge of the 6th Division, and then in April he was placed in command of the 1st Division of the Reserve Corps of the Army of Rhine. Delmas fought at the Battles of Engen and Messkirch with this division until replaced by General Grandjean. Transferred back to Italy, he served under General Brune, distinguishing himself at the Battle of Pozzolo, seizing the redoubts at Salionze, and assisting in the attack on Verona.