The Isthmus of Chignecto had been fought over for decades. Despite Britain's conquest of Acadia in 1710, Nova Scotia remained primarily inhabited by Catholic Acadians and Mi'kmaq people. The Wabanaki Confederacy, which included the Mi'kmaq, had a long history of raiding British colonial settlements along the Maine-Acadia border. By the time Governor Edward Cornwallis arrived to establish Halifax with thirteen transports on June 21, 1749, the pattern was deeply established: British settlement would be met with Indigenous and French resistance. Within eighteen months, the British built fortifications across peninsula Nova Scotia -- at Windsor, Grand Pre, and Chignecto -- asserting control over every major Acadian community. The isthmus was the last piece, and both sides knew whoever held it controlled the passage between the Bay of Fundy and the Gulf of St. Lawrence.

Lawrence returned on September 3, 1750, and this time he brought overwhelming force. Captain John Rous commanded the naval element while Lawrence and John Gorham led over 700 soldiers from the 40th, 45th, and 47th Regiments. They found Mi'kmaq and Acadian fighters waiting on the shore behind hastily thrown-up breastworks. The defenders fired on the landing parties, killing twenty British soldiers, including Captain Francis Bartelo. British fire killed several Mi'kmaq in return. It was a fierce and bloody greeting, but the numbers were decisive. Le Loutre's militia withdrew toward Fort Beausejour, burning whatever Acadian crops and houses remained standing as they retreated. The scorched earth that had saved them in the spring now merely slowed the inevitable advance.

The aftermath produced one of the war's ugliest episodes. On October 15, 1750, a group of Mi'kmaq men disguised themselves as French officers and called Edward How, a member of the Nova Scotia Council, to a peace conference. It was a trap. Organized by a Mi'kmaq leader named Etienne Batard, the ruse gave the attackers the opportunity to wound How so gravely that he died five or six days later. Captain La Valliere, the only European eyewitness, recorded the details. The killing of How under a flag of truce hardened British attitudes and poisoned any remaining hope for negotiated coexistence. Both sides were now committed to a course that would end only with one of them being driven from the isthmus entirely.

After securing the landing area, the British built Fort Lawrence at Chignecto, establishing a permanent military presence on the south bank of the Missaguash River. Across the water, the French answered with Fort Beausejour. For five years the two forts faced each other, a loaded standoff on a marshy frontier. The Mi'kmaq and Acadians continued their resistance with raids on Dartmouth, Halifax, and the settlements the British were building across Nova Scotia. The Battle at Chignecto was not the kind of decisive engagement that ends a war; it was the kind that starts one. Five years later, in 1755, the British would cross that river in force, take Fort Beausejour, and set in motion the Expulsion of the Acadians. Every burned village, every ambushed patrol, every act of defiance and retaliation on the isthmus in 1750 was a step toward that reckoning. The Mi'kmaq and Acadians who fought at Chignecto were defending a world that, within a decade, would be violently unmade.