Robert Rogers became known during the French and Indian War as a commander of ranger companies attached to the British forces. Operating around Lakes George and Champlain, the rangers scouted enemy positions, carried intelligence and conducted raids beyond the routes used by conventional armies. Their work drew on experience of woodland warfare and Native tactics, requiring attention to movement, concealment, supplies and withdrawal.

Rogers developed instructions for ranging and became valued by senior British commanders despite concerns about the companies' cost and discipline. His most notorious expedition was the attack on the Abenaki community of Odanak, also called Saint-François, in 1759. The raiders burned the settlement and killed inhabitants; Rogers's claim for the number killed is much higher than French estimates. The return became a desperate struggle with pursuit, hunger and heavy losses among his own men.

In 1760 he participated in the conquest of Canada and subsequently took possession of western French posts for Britain, including Detroit. Further service during Pontiac's War was followed by debt and efforts to secure new employment. Publishing his journals and other works in London helped publicize his achievements. He sought backing for western exploration and became commandant at Michilimackinac, where ambitious plans and disputes with other officials ended in accusations and loss of office.

After unsuccessfully seeking Continental employment, Rogers served Britain during the Revolution and attempted to raise troops, including the Queen's Rangers and later the King's Rangers. His later commands did not repeat his earlier success. Financial problems and declining standing marked his final years, and he died in London in 1795. Modern commemoration often emphasizes tactical lessons, while his career also requires attention to imperial warfare and violence against Native communities.