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 headed 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). When Grimarest retreated, Mourgeón and his troops were caught in a pincer movement by Morlot's division.