Marshall studied law and was
called to the Bar at the
Middle Temple in 1868. He practised law in
Manchester where he helped to found
The Catholic Times. In 1873 he accepted an appointment in the British Colonial Service as Chief Magistrate and Judicial Assessor to the native chiefs in the Gold Coast, arriving there in July. On the breaking out of the
Ashanti War in 1874, he secured the chiefs' assent to the impressment of their tribesmen, and was of great use throughout the campaign in raising levies. He made a good impression on the
Ashanti people, who regarded him as a veteran general who had lost his arm in battle. In 1874 Marshall left the Cape Coast and transferred, on his promotion to
Puisne Judge, to
Lagos, arriving there in January 1875. He served as Chief Justice of the Gold Coast (now Ghana) from 1880 to 1882. ==Role in the Catholic Church==