Further appearances in the first team (20 in total with four goals) were recorded before Tull's contract was bought by Southern Football League club Northampton Town on 17 October 1911 for a "substantial fee" plus Charlie Brittain joining Tottenham Hotspur in return. Tull made his debut four days later against Watford, and made 111 first-team appearances (105 in the League), scoring nine goals for the club. The manager Herbert Chapman – also a Methodist – was a former Spurs player and had played as a young man with Arthur Wharton at Stalybridge Rovers; he went on to manage both Huddersfield Town and Arsenal to FA Cup wins and League championships.