Despite the British Conquest of Acadia in 1710, Nova Scotia remained primarily occupied by Catholic Acadians and Mi'kmaq. Father Le Loutre's War began when Edward Cornwallis arrived to establish Halifax with 13 transports on June 21, 1749. By unilaterally establishing Halifax, the Mi'kmaq believed the British were violating earlier treaties , which were signed after Dummer's War. The British quickly began to build other settlements. To guard against Mi'kmaq, Acadian and French attacks on the new Protestant settlements, British fortifications were erected in Halifax, Dartmouth, Bedford , Lunenburg and Lawrencetown. Within 18 months of establishing Halifax, the British also took firm control of peninsula Nova Scotia by building fortifications in all the major Acadian communities: present-day Windsor ; Grand Pre and Chignecto. The only land route between Louisbourg and Quebec went from Baie Verte through Chignecto, along the Bay of Fundy and up the Saint John River. With the establishment of Halifax, the French recognized at once the threat it represented and that the Saint John River corridor might be used to attack Quebec City itself. To protect this vital gateway, at the beginning of 1749, the French strategically constructed three forts within 18 months along the route: one at Baie Verte, one at Chignecto and another at the mouth of the Saint John River. Effectively a fortified warehouse manned by a small garrison, it was built in 1751 by the order of the Marquis de la Jonquière as a way station between Fort Beauséjour and Louisbourg and Québec. It was originally a palisaded earthwork, measuring 180 feet square and surrounded by a ditch. At each corner was a blockhouse equipped with small borecannon. Communication with Fort Beauséjour across the Isthmus of Chignecto was at first via an ancient portage route, but, in 1754, a road was built linking the two forts. Communication by sea was possible in the summer to Québec, Louisbourg and France.
During the Seven Years' War, immediately after the Battle of Fort Beauséjour in 1755, the British sent 300 men, led by Colonel John Winslow, to take Fort Gaspareaux, then under the command of Captain Villeray. This was quickly accomplished, and the fort was renamed Fort Monckton and put under the charge of an English garrison. In the spring of 1756, Mi’kmaw militia ambushed a wood gathering party from Fort Monckton, and scalped nine of them. These soldiers' remains are in a small military graveyard at the fort. The British abandoned the fort later in the same year.
A stone cairn was erected by the National Historic Sites and Monuments Board in the 1930s to commemorate the fort. The site today consists of a ditched enclosure. Palisaded grounds once surrounded the grounds on the inside of the ditch. There is a small cemetery - the headstones are now illegible. An unmanned light structure was erected in 1972.
