 Since making his debut, he became the club's first team regular for Hartlepool United and was an ever-present player to the team until he suffered a groin injury in October 2010.After returning to the first team from injury, Horwood scored his first league goal in a follow up match against Colchester United, in which Hartlepool United lose 3–2.Then in a second match against Colchester United of the season on 5 February 2011, he played a vital role in a 1–0 win when he set up a goal for Antony Sweeney to score the only goal in the game.