George Russel Deare came to South Africa from France in 1877 and from 1879 to 1888 served in the wars against the Zulus and Basutos. By 1881 he was the officer commanding the volunteer corps at Port Elizabeth, known as Prince Alfred's VolunteerGuards. Led by Major Deare, the unit played a prominent part in the "Basuto Gun War" of 1880-1881. By 1886 he was furthermore a justice of the peace in Port Elizabeth, and a member of the committees of both the Port Elizabeth Agricultural Society and the Port Elizabeth Turf Club. He was one of several persons who assisted the Port Elizabeth Museum with its work in natural history in 1888. He also compiled a pamphlet, Insect and fungus pests of fruit trees and other farm and garden crops: how and when to treat them (Piermaritzburg, 1893. The publication is said to be compiled from the very best and latest authorities, and to contain a short description of Nixon's "Climax" sprayers.
A manuscript by Deare on plans to overthrow the government of the South African Republic (Transvaal) in 1895 is housed in the Cory Library, Grahamstown. A manuscript by him entitled 'Eighteen months with the last of the slave raiders' is held in the Strange Collection of the Johannesburg Public Library, and a copy of the manuscript in the National Archives, Bloemfontein. In 1889 he resided in Melmoth, KwaZulu-Natal. In 1899 he resided in Scottburgh, Natal, where he rented a property and was involved with alterations to the rail siding. During 1902 to 1907 G.R. Deare, presumably him, lived in Durban.