In 1800, he won great credit both by his exertions in bringing the artillery of the Army of Reserve over the Alps and by his handling of guns in the Battle of Marengo.
In 1806, as a brigadier general and commander of the artillery of an army corps, he took part in the Jena and Eylau.
[1] But he is remembered chiefly for the case shot attack, which was the central feature of Napoleon's matured tactical system and which Sénarmont put into execution for the first time at the Battle of Friedland.
In the battle he was chief of artillery for the 1st corps and demonstrated the case shot for good effect on the masses of russian infantry.
[2] For this feat, he was made a baron, and in 1808, he was promoted to divisional general by Napoleon on the field of battle in front of Madrid.