Leagrave, Bedfordshire born winger Sid Hoar had been with Luton Clarence prior to World War One, and subsequently joined the Army serving in the trenches of Northern France where a gas attack seriously injured him, throwing his future football career into doubt. He made a full recovery and joined Luton Town after the War scoring a penalty in their inaugural Football League fixture against Portsmouth in August 1920, and being a regular in their line up over the next 4 and a half years, playing alongside the likes of Ernie Simms, Louis Bookman and George Butcher.
His performances for The Hatters were enough to persuade Arsenal manager Leslie Knighton to sign the versatile wideman for £3,000 in November 1924 with Sid going straight into the Arsenal side making his debut against Cardiff City on November 29th. His ability to perform down either flank helped him keep his place in the starting eleven despite the arrival at Arsenal of a hatful of wingers throughout the late 1920s, such as Welsh international Charlie Jones. Sid also played for the Gunners in their famous FA Cup Final defeat to Cardiff City in 1927. However he only played 7 times in 1928-29, his last game an FA Cup quarter final defeat to Aston Villa in March 1929, and after 18 goals in 117 appearances, he joined Clapton Orient for a fee of £1,000 in September 1929, for whom he scored 3 times in 31 appearances before retiring in 1930.