The siege of Fort William, Scotland took place between 20 March and 3 April 1746. Prior to the siege the Jacobites had forced the surrender of Fort Augustus after a siege of just two days, from where they proceeded to Fort William with cannons they had taken from Fort Augustus. They arrived with siege cannon on 20 March and both Cameron of Lochiel and MacDonald of Keppoch wrote to their Jacobite leader, Charles Edward Stuart to tell him that they had declared war on the Clan Campbell.