He reached the rank of Brigade Surgeon - Lieutenant - Colonel of the North London Volunteer Rifle Brigade .
Thomas was a volunteer soldier with the British Army and founded a bearer company in north London , the predecessors of the army 's modern field ambulance units .
Thomas reached the rank of Brigade Surgeon - Lieutenant - Colonel of the North London Volunteer Rifle Brigade .
Thomas was a volunteer soldier with the British Army and founded a bearer company in north London , the predecessors of the army 's modern field ambulance units .