During the 1672-74 Third Anglo-Dutch War, Douglas's was part of the British Brigade that fought with the French, commanded by the Duke of Monmouth. It served in the Rhineland throughout the Franco-Dutch War, even after the Anglo-Dutch war ended in February 1674; it became the Régiment de Dumbarton in 1675, after George Douglas was made Earl of Dumbarton. The 1678 Treaties of Nijmegen required the repatriation of all Scots and English units from France; reluctant to lose veteran troops, this was made as hard as possible. Dumbarton's was posted to the Dauphiné in Southern France before being disbanded and its men prevented from travelling for 30 days thereafter; many chose to remain, while those who arrived in England did so without money or possessions.