Henry Manners Chichester, Dictionary of National Biography… (1889)
“ Erskine served as deputy quartermaster-general, with the rank of lieutenant-colonel, in the blundering expedition to L'Orient in 1746, under command of his uncle, Lieutenant-general Hon. James St. Clair, where he was wounded. He afterwards served with the 1st Royal Scots in Flanders, where his elder brother, Sir Charles, fourth baronet, a major in the same regiment, was killed at the battle of Val (otherwise Laffeldt or Kisselt) , 2 July 1747. Erskine was returned in parliament for Ayr in 1749, and represented Anstruther from 1754 to his death in 1765. ”
