He served with distinction at Quatre Bras and the Battle of Waterloo. Promoted in early June (3June 1815) to major general, he was assigned to the First Corps, under overall command of the Prince of Orange. On 18June, the day of Waterloo, he commanded two battalions of the 1st Foot Guards, each 1000-men strong and led the Guards in repelling the final assault of the French Imperial Guard. For his service at Waterloo, Maitland was created a Knight Commander of the Order of the Bath, (KCB) on 22June 1815, the Dutch Order of Wilhelm and the Russian Order of St. Vladimir. For their part, the 1st Foot Guards were granted the honorary title of 'First or Grenadier Regiment of Foot Guards'.