In 1763, Great Britain obtained possession of the Natchez territory by treaty with France, and the British Union Jack was flung to the breezes from the ramparts of Fort Rosalie. Under British rule, Natchez was a part of the Province of West florida, and the chief outpost of Great Britain on the Mississippi River, Natchez was under British rule during a greater part of the Revoluntionary War and its citizens being for the most part French and Spanish, Natchez took little part in the war for American independence. Her citizenship was increased materially during this period by Loyalists who migrated from the Atlantic sea board, bringing with them their families, their wealth, and their slaves.