Fort St. George was a British colonial fort built at present-day Thomaston, Maine during the lead up to Father Rale's War.
In 1719–1720, the old trading post was remodeled into a fort protected by two blockhouses. But Abenaki Indian tribes protested the encroachment of an English fort on their territory. Instigated by the French, they attacked the garrison twice during Dummer's War in 1722, which was relieved by Col. Thomas Westbrook, then raided again in 1723 with a siege lasting 30 days.
The Commanders were Thomas Smith, John Gyles (who also served at Fort George (Brunswick, Maine)) Jabez Bradbury (who also served at Fort Richmond (Maine) and Captain John North.
In the spring of 1724, the command of St. George's Fort at Thomaston was given to Capt. Josiah Winslow (older brother of John Winslow). On 30 April 1724, during the Northeast Coast Campaign (1724), Winslow and Sergeant Harvey and 17 men in two whale boats left George's Fort and went downriver several miles to Green Island. The following day, the two whale boats became separated and approximately 200–300 Abenaki descended on Harvey's boat, killing Harvey and all of his men except three native guides who escaped to the George's fort. Captain Winslow was then surrounded by 30 to 40 canoes, several with four or six men apiece aboard, which came off from both sides of the river and attacked him with great fury. With the Indians closing on him with their canoes, Winslow fired upon them when they were almost aboard him. After hours of fighting, Winslow and his men were killed, except for three friendly Indians who escaped back to the fort (one was named Wm. Jeffries of Harwich). The native Tarrantines were reported to have lost over 25 warriors.