Dallemagne held important posts during the Siege of Mantua. After the Battle of Bassano and the combat of La Favorita, he led an attack to drive the Austrian garrison back within the fortress on 24 September. During the Battle of Arcole campaign, Dallemagne led a small division under the orders of Charles Kilmaine. In the Battle of Rivoli campaign, he commanded a division under Serurier in the siege. A division came under his orders in the invasion of Austrian during the spring of 1797.