Manoeuvres
Early on 22 July, Marmont's army was moving south, with its leading elements southeast of Salamanca. To the west, the Marshal could see Wellington's 7th Division deployed on a ridge. Spotting a dust cloud in the distance, Marmont surmised that most of the British army was in retreat and that he faced only a rearguard. He planned to move his French army south, then west to turn the British right flank.
Marmont was mistaken. Wellington actually had most of his divisions hidden behind the ridge. His 3rd and 5th Divisions would soon arrive from Salamanca. Wellington had planned to retreat if outflanked, but he was watching warily to see if Marmont would make a blunder.
Marmont planned to move along an L-shaped ridge, with its angle near a steep height known as the Greater Arapile. That morning, the French occupied only the short, north-pointing part of the L. For his flanking move, Marmont sent his divisions marching west along the long side of the L. The Anglo-Allied army lay behind another L-shaped ridge, inside and parallel to the French L, and separated from it by a valley. Unseen by the French, Wellington assembled a powerful striking force along the long side of the British L.
As Marmont reached to the west, the French became strung out along the long side of the L. Thomières's division led the way, supported by Curto's cavalry. After that came Maucune, Brenier, and Clausel. Bonet, Sarrut and Boyer were near the Greater Arapile. Foy and Ferey still held the short side of the L.
Read more about this topic: Battle Of Salamanca