Walter's performances for Clapton alerted the attentions of Tottenham Hotspur, who signed him in 1909. In doing so he became one of the first footballer's of mixed-heritage to play in England's top division. However despite excelling in his position, Tull was subjected to racial abuse and was subsequently dropped from the team.

"Let me tell those hooligans that Tull is so clean in mind and method as to be a model for all white men who play football. In point of ability, if not actual achievement, Tull was the best forward on the field" - Football Star 1909