In 1891 Marshall was selected for another rugby first, when he was chosen to represent the British Isles team on their first official overseas tour. Played in South Africa, the British Isles team faced 17 regional and invitational teams, and three international Tests against South Africa national team. Marshall played in two international games, paired with Edward Bromet in the Second Test at Kimberley and then with Arthur Rotherham in the third and final Test, at Cape Town.