On the opening day of the Battle of the Pyrenees at Maya Pass, Stewart concluded that the French would not attack, then rode ten miles to the rear. When the battle began, his 2nd Division was left to fight all morning under an inexperienced brigade commander and lost 1,347 men. Still in Hill's corps, Stewart fought at the battles of the Nive, Orthez and Toulouse during Wellington's 1814 invasion of southern France.