The 123-man 1st Cavalry was in François Étienne de Kellermann's brigade at the Battle of Marengo on 14 June 1800. The regiment was part of Kellermann's famous charge late in the afternoon. Another source does not mention Marengo, but tells about an incident that occurred later in the campaign when Guillaume Brune was in command of the Army of Italy. Margaron with only 200 horsemen and two artillery pieces was nearly surrounded by enemy cavalry that issued from the entrenched camp of Verona. He led two vigorous charges and retook the village of San Massimo, driving back and capturing 100 enemy horsemen. According to its service record, the 1st Cavalry fought at the Battle of Pozzolo (Mozambano) on 25–26 December 1800 and at San Mossimo in 1801.