Walter Tull was born in Folkestone on 28th April 1888. His father was a carpenter from Barbados who had moved to Folkestone and married a local woman. By the age of nine, Walter had lost both his parents, and when he was 10 he and his brother Edward were sent to a Methodist orphanage in Bethnal Green. His brother left the orphanage two years later, was adopted by a Scottish family and became a dentist. Meanwhile, Walter played for the orphanage football team, and in 1908, began playing for Clapton FC. Within a few months he had won winners' medals in the FA Amateur Cup, London County Amateur Cup and London Senior Cup. In March 1909 the Football Star called him 'the catch of the season'.

In 1909 he signed as a professional for Tottenham Hotspur, and experienced for the first time spectator racism when Spurs travelled to play Bristol City. According to one observer, 'a section of the spectators made a cowardly attack on him in language lower than Billingsgate.' The correspondent continued:

In October 1911 Tull moved to Northampton Town where he played half-back and scored nine goals in 110 senior appearances. When the First World War broke out, be became the first Northampton player to sign up to join the 17th (1st Football) Battalion of the Middlesex Regiment, and in November 1915 his battalion arrived in France.

The Army soon recognised Tull's leadership qualities and he was quickly promoted to the rank of sergeant. In July 1916, Tull took part in the major Somme offensive. Tull survived this experience but in December 1916 he developed trench fever and was sent home to England to recover.

Tull had impressed his senior officers and recommended that he should be considered for further promotion. When he recovered from his illness, instead of being sent back to France, he went to the officer training school at Gailes in Scotland. Despite military regulations forbidding "any negro or person of colour" being an officer, Tull received his commission in May, 1917.

Lieutenant Walter Tull was sent to the Italian front. This was an historic occasion because Tull was the first ever black officer in the British Army. He led his men at the Battle of Piave and was mentioned in dispatches for his "gallantry and coolness" under fire.

Tull stayed in Italy until 1918 when he was transferred to France to take part in the attempt to break through the German lines on the Western Front. On 25th March, 1918, 2nd Lieutenant Tull was ordered to lead his men on an attack on the German trenches at Favreuil. Soon after entering No Mans Land, Tull was hit by a German bullet. Tull was such a popular officer that several of his men made valiant efforts under heavy fire from German machine-guns to bring him back to the British trenches. These efforts were in vain as Tull had died soon after being hit. He was awarded the British War and Victory Medal and recommended for a Military Cross.

He was the first British-born black army officer and the first black officer to lead white British troops into battle.