In the winter of 1809, the unit was based at Badajoz, however, the next year the Battery accompanied the now Lord Wellington in his campaign, which included the encounter at the Battle of Bussaco and also the retreat of the Lines of Torres Vedras. In 1811, Lawson advanced the company from the Lines and saw action at the Battle of Fuentes de Oñoro in May 1811. The battery was replenished six months later with 6-pounders, and fought a hard battle at Salamanca, suffering casualties whilst in action, and at the Siege of Burgos, before the retreat to Portugal. At the commencement of the 1813 campaign, Lawson's Company was part of the 6th Division.