Thesiger was promoted to major general in March 1877, appointed to command British forces in the Cape Colony with the local rank of lieutenant general in February 1878, and in October succeeded his father as 2nd Baron Chelmsford. He brought the Ninth Cape Frontier War to its completion in July 1878, and was made a Knight Commander of the Order of the Bath in November 1878. His experiences fighting against the Xhosa created a low opinion of the fighting capabilities of African soldiers, which later led to disastrous consequences during the Anglo-Zulu War.