Marshal André MassénaThe French Army of Portugal
Masséna's army was organised into four corps and a cavalry reserve. Louis Henri Loison's VI Corps had three divisions, led by Jean Gabriel Marchand, Julien Augustin Joseph Mermet, and Claude François Ferey.
Wellington commanded six infantry divisions, Charles Ashworth's independent Portuguese brigade, and three cavalry brigades. Brent Spencer commanded the 1st Division, Thomas Picton the 3rd, William Houston the 7th, and Robert Craufurd the Light Division. Stapleton Cotton commanded John Slade's and Frederick von Arentschildt's brigades of cavalry. Edward Howorth supervised four British (Ross RHA, Bull RHA, Lawson, Thompson) and four Portuguese (Arentschildt (2), Da Cunha, Rozierres) 6-gun batteries. William Erskine (5th Division), Alexander Campbell (6th Division), and 300 Portuguese cavalry under Count Barbacena were detached, facing the French II Corps.
