 On the last game of the season against Stockport County, he was sent–off in the first half, in a 5–0 loss.His loan at Darlington was later extended until the end of the 2006–07 season and have established himself in the first team, in which he finished with 21 appearances.On 31 August 2007, Horwood joined Scottish Premier League side Gretna on loan until January 2008, making his debut in a 2–1 defeat against Kilmarnock on 15 September 2007.