At Salamanca in July 1812, his isolated division was wrecked by a combination of British infantry and cavalry attacks led by Lieutenant-General Stapleton Cotton, (later Viscount Combermere).

[1] In June 1813, the British surprised his troops at San Millán de la Cogolla.

The division missed the Battle of Vitoria but helped fight off the Allied pursuit at Tolosa.

Maucune was adjutant to General of Division François Watrin at the Battle of Trebbia.

On the second day of battle, 19 June 1799, he personally led some troops in an attack along the south bank of the Po River.