During the summer of 1811, Sánchez had effectively cut communications between Ciudad Rodrigo and Salamanca, defeating any body of troops fewer than 400 men. With Ciudad Rodrigo now occupied by the French, Sánchez was able to attack their convoys and in June, at San Muñoz, his 200 horsemen, accompanied by 300 foot soldiers attacked a convoy protected by 600 grenadiers, and killing or taking prisoner 360 of them. Although provisions, escorted by a much larger force, managed to reach Ciudad Rodrigo in July, by the end of August these were again running low.
