Thames Ironworks F.C. only ten players on the pitch. The final score of 4–1 was a complete reverse of their previous encounter. Already confirmed as Southern League Division Two champions, having won the previous 14 games, Thames Ironworks showed little restraint for the final game of the season against Maidenhead on 15 April 1899. With the largest home crowd of the season of 3000 spectators, The Irons demolished the bottom club of the division 10–0. The goals included four from Patrick Leonard and a hat-trick from David Lloyd. Although they won the Southern League Second Division by 9 points, Thames Ironworks were required
Thames Ironworks F.C. Taylor returned to refereeing, handing over organizational duties to Ted Harsent, who became the first club secretary. The birth of Thames Ironworks F.C. coincided with the demise of Old Castle Swifts, the first professional football club in Essex. Thames took over the tenancy of Castle Swifts' Hermit Road ground in Canning Town and signed a number of Old Castle Swifts players, including former Woolwich Arsenal full back Robert Stevenson, who became the club's first ever captain and is credited as being the team's first player of note. The Ironworks played their first ever fixture against Royal Ordnance reserves on 7