a compliment to the squad overall that the likes of Arnold and Delano Sam-Yorke amongst others found themselves on the sub's bench on many occasions. He did however play a key role in getting Cambridge United to the FA Trophy final by scoring the winner in the first round against Salisbury City and also against St. Albans City in the second round. He then made an appearance in every game of the cup run including a 20-minute appearance at Wembley Stadium for the final where Cambridge United beat Gosport Borough 4–0 to lift the trophy, and also contributed to them finishing the season in 2nd place and a play-off spot. At the end of the 2014–15 season the club did not offer him a new deal when his contract expired. Grimsby Town On 19 July 2014, Arnold joined Grimsby Town on a season long loan deal. Although he started his Grimsby Town career injured he went on to establish himself firmly as a first team starter and helped guide them to the play-offs, where he scored two wonderful goals in the 1–2 play off semi-final win over Eastleigh. The club narrowly missed out promotion by losing out in the 2015 Conference Premier play-off Final at Wembley Stadium to Bristol Rovers on penalties, although Arnold set up Lenell John-Lewis' opening goal with a run from the half-way line and then went on to draw 1–1 after extra time. His efforts over the season earned him a place in the National League team of the year, alongside the league's outstanding players. On 29 May 2015, he joined the club on a permanent one-year deal after being released by Cambridge United, citing the positivity around the club following their narrow avoidance of promotion, even despite reported interest from Football League teams. Over the course of the 2015/16 season Arnold once again played an integral part in taking Grimsby to the play-off and FA Trophy finals. Arnold scored the third goal in Grimsby's 3–1 victory over Forest Green Rovers in the 2016 National League play-off Final at Wembley, seeing Grimsby promoted to League Two after a six-year absence from the Football League. At the end of the season, he was offered new terms, but after mulling over the contract, Arnold decided to seek a fresh challenge. "Several factors" were behind the decision. Lincoln City On 29 July 2016, Arnold signed for Lincoln City; he