Leading the vanguard of Grimarest's 2nd Andalusian Division, part of General Castaños's Army of the Centre, which was defeated by Marshal Moncey at Lerín (25 October), Mourgeón and his troops found themselves surrounded by Morlot's division when Grimarest retreated.
Mourgeón commanded the vanguard of Grimarest's 2nd Andalusian Division, part of General Castaños's Army of the Centre, which was defeated by Marshal Moncey at Lerín (25 October). As Grimarest's troops withdrew, Mourgeón and his men were trapped by Morlot's division.