Walter Tull was the second Black (mixed race) professional footballer in Britain and played for Clapton (which later became Leyton Orient) and Tottenham Hotspur before the First World War. He served as an officer in the war and was killed in action in Flanders just before the war ended in 1918.
To piece together his remarkable story go to
Walter's War (TV dramatisation)
Channel 4
Football unites, racism divides
Walter Tull, forgotten hero (TV documentary)
The Guardian
Daily Mail
BLACK AND ASIAN SOLDIERS OF THE FIRST WORLD WAR - a webquest
(Click on the heading above for the link)