Lord Bernard was to be created Earl of Lichfield by King Charles I for his actions at the first and second Battles of Newbury and at the Battle of Naseby but he died of injuries received leading a sortie against besieging Parliamentary forces in the Battle of Rowton Heath in September 1645, before the requisite letters patent were drawn up. The titles of Baron Newbury and Earl of Lichfield were instead created in December 1645 for his six-year-old nephew, Charles Stewart, 3rd Duke of Richmond, 6th Duke of Lennox (1639–1672), the son of Bernard's elder brother George Stewart, 9th Seigneur d'Aubigny, killed at the Battle of Edgehill in 1642. His elder brother Lord John Stewart (1621-1644) was also killed during the Civil War.