 Complete the following phrase:  When Ponsonbys command, the 5th Dragoon Guards, arrived in the Peninsula in October 1811, it became part of John Le Marchants heavy cavalry brigade. For the rest of the war, this brigade included the 5th Dragoon Guards and the 3rd and 4th Dragoons. Ponsonby took part in Le Marchants famous charge at the Battle of Salamanca in July 1812. On that occasion, the British heavy dragoons rode down one French infantry division and part of a second before being repulsed. Upon Le Marchants death in the battle, Ponsonby took over the brigade, participating in the campaign that included the 