Pearson was born in Somerset. He served as an officer in the
Royal Welch Fusiliers, in the
Netherlands and in the
Battle of Alexandria. Later, he fought at the
Battle of Copenhagen (1807) and the capture of
Martinique in 1809. Transferred with his regiment to the
Peninsular War, he was present at the
Battle of Albuera in 1811, where he commanded the British light infantry. After the battle he temporarily commanded a brigade of Fusilier regiments. Later in the year he suffered a leg wound and returned to Britain on sick leave. Early in 1812, he was sent to Canada as Inspecting Field Officer of Militia. After the outbreak of war with America, Pearson was appointed Commandant of Fort Wellington at
Prescott, in the middle of 1813. Late in the year, an American expedition under
James Wilkinson passed by Prescott. Pearson attached part of his garrison to the pursuing British force under Lieutenant Colonel
Morrison and led them at the decisive
Battle of Crysler's Farm. In 1814, Pearson led a detachment of light troops in the Niagara peninsula, and fought at the battles of
Chippawa and
Lundy's Lane, and in the
Siege of Fort Erie, where he was wounded again. After the end of the War, Pearson returned to command his regiment. He was knighted and promoted to major-general in 1833 and to lieutenant-general in 1841. He was given the colonelcy of the
85th Regiment of Foot (Bucks Volunteers) from 1843 to his death in 1847. ==References==