

The main information is from the book, Jamaican Volunteers in the First World War: Race, Masculinity and the Development of a National Consciousness, by Richard Smith, Manchester, Manchester University Press, c. 2004, ISBN: 0719069858. Review of book
The two main units mentioned and expounded upon in this marvellous book are the West India Regiment(s) (WIR), which was made up of mainly Jamaicans; and the British West Indies Regiment (BWIR), which was made up of members from different West Indies colonies. See pp. 57-58, 88-90.
The British West Indies Regiment (BWIR) was divided into 12 battalions. (p. 80):
1st Battalion, pp. 89-90;
2nd Battalion, p. 90;
3rd Battalion, p. 133;
4th Battalion, pp. 83-85, 126;
6th Battalion, pp. 82, 84;
7th Battalion, p. 154;
9th Battalion, pp. 83, 130;
10th Battalion, p. 130;