The Battle of Buçaco () or Bussaco (27 September 1810) resulted in the defeat of French forces by Lord Wellington's Anglo-Portuguese Army, in Portugal during the Peninsular War. Having occupied the heights of Bussaco (a 10-mile long ridge located at 40°20'40"N, 8°20'15"W) with 25,000 British and the same number of Portuguese, Wellington was attacked five times successively by 65,000 French under Marshal André Masséna. Masséna was uncertain as to the disposition and strength of the opposing forces because Wellington deployed them on the reverse slope of the ridge, where they could neither be easily seen nor easily softened up with artillery. The actual assaults were delivered by the corps of Marshal Michel Ney and General of Division (MG) Jean Reynier, but after much fierce fighting they fa