Corps législatif
Beginning in 1797, Dallemagne held commands at Boulogne, Ancona, Rome, and Mainz. He asked to be retired from the army in December 1799, which became official in 1802. Meanwhile, he began a political career and served as a deputy in the Corps législatif. Dallemagne married Jeanne Christine Gaudet (1785–1849) on 19 February 1800. They had two sons, Clément and Claudius.