At Wellington's request, Commissary General John Bissett was then brought in to oversee the Royal Waggon Train. By 1810, newly ennobled Viscount Wellington had ordered the construction of the Lines of Torres Vedras; a series of secret forts that repelled an offensive by French commander André Masséna. Other key successes at the Siege of Badajoz between March and April 1812, the Battle of Salamanca in July of the same year, and the Storming of Saint Sebastian in August 1813 allowed Wellington's forces to drive Napoleon's forces back into France. The Royal Waggon Train was responsible for transporting supplies and wounded during these key battles and throughout the Peninsular War. With public opinion against him, Emperor Napoleon was forced to abdicate on 31 March 1814, leading to his exile on the island of Elba.