Shirley's and Pepperrell's

From the wiki:

Two regiments were raised locally with funds supplied by the British Crown, entering the army list as the 50th (Shirley's) and 51st (Pepperrell's) Regiments of Foot. Both regiments took part in the disastrous British campaign of 1755/56. Overwintering near Lake Ontario, the force occupied three forts, Oswego, Ontario and George, collectively known as Fort Pepperrell. Surrounded and besieged by a French force under Montcalm, both regiments surrendered after the local commander was killed. A fair number of the prisoners were massacred by the Indian allies of the French before they reached Montreal. Both regiments were subsequently removed from the army list.

Thanks to Thomsomfeld.- more on the 50th/51st here