During the 1912–13 English football season, Brentford competed in the Southern League First Division. Two long losing runs led to the Bees' relegation to the Second Division on the final day of the season.
Brentford had a torrid beginning to the season, losing 12 of the first 15 matches.[2] Of the starting forward line of Billy Brawn, Jack Sibbald, Frederick Chapple, Bob McTavish and Patsy Hendren, Chapple and Hendren were the only players to score during the period,[2] which lead manager Halliday to sign Chelsea's Hugh Dolby and Bill Smith from non-league football.[1] Dolby failed to score in four matches and was dropped, while Smith helped contribute to a revival in mid-November, after full back Dusty Rhodes replaced Fred Halliday as manager on 13 November 1912.[2] Between 9 November and 5 March 1913, Brentford lost just three matches, but another loss of form and injuries to the forward line led to seven consecutive defeats in March.[2] A crucial 4–1 victory over Brighton & Hove Albion on 5 April boosted the Bees' survival chances, but a defeat and a win in the following two matches respectively put Brentford one place above the relegation zone going into the final day, level on points with Norwich City, but ahead by virtue of a 0.774 goal average.[1]
Brentford would play away to Merthyr Town and Norwich City away to Reading on Saturday 26 April, but torrential rain and gale force winds forced the Bees' match to be postponed twice, to the following Tuesday.[1] Norwich City won their match 5–2, but the scoreline would not guarantee the Canaries' safety on goal average if Brentford won their match by any score.[1] On Tuesday 29 April, Brentford conceded the opening goal to Merthyr Town, before Bill Smith equalised two minutes after half time.[1] In the final 10 minutes, Brentford pushed forward and were hit on the break with just two minutes remaining, losing the match 2–1 and with it the club's First Division status.[1]
Source: rsssf.com Rules for classification: The system of using goal average to separate two teams tied on points was used up until the 1976-77 season. The points system: 2 points for a win, 1 point for a draw and 0 points for losing.
^The match was a replay of the original fixture on 26 December 1912, which was abandoned after 49 minutes due to a waterlogged pitch. Plymouth Argyle were leading 2–0 at the time.