By the time he arrived, Strathallan had been replaced by his cousin Lord John Drummond, who countermanded these orders. As a serving officer in the French army, he had instructions not to enter England until all fortresses held by British government troops in Scotland had been taken.
Commanded by Lord Kilmarnock, the Perthshire Horse accompanied the invasion of England, while Strathallan remained in Perth to raise additional troops. On 21 November, Colonel Lachlan Maclachlan, killed at Culloden, was sent back to Scotland with instructions to gather these recruits and bring them into England.