Johnstone sailed on his expedition from Spithead on 13 March 1781 in command of 46 ships and 3,000 troops under General Sir William Medows .
Johnstone 's squadron was dispatched on a secret expedition to capture the Dutch colony at the Cape of Good Hope .
Johnstone sailed on Johnstone 's expedition from Spithead on 13 March 1781 in command of 46 ships and 3,000 troops under General Sir William Medows .
Johnstone 's squadron was dispatched on a secret expedition to capture the Dutch colony at the Cape of Good Hope .