Army United represented the
Royal Thai Army and had traditionally been Thailand's yo-yo club along with the Navy and Police clubs. Up until 2010, and the name change from the Royal Thai Army to Army United, the club lacked support and had dwindling crowds, and were mainly supported by Army personnel shipped in for the games. The Army team had always been a mid ranking Thai team with their biggest successes coming in the
Thai Division 1 League with a championship in the 2004–05 season and 2nd place in 2009. Both of these successes had of course come after relegation from the Thai Premier League. The club were based in the
Din Daeng District of Central
Bangkok, which is the area that bases the Royal Thai Army. Up until the 2011 season, the club operated a policy of only playing homegrown talent, but ditched this as the game became more professional and foreign players were brought into the team. Previously, the players would work for the Army during the week and play football on weekends, somewhat different from most clubs who operated on a full-time basis. In the 2010 season, they were reprieved from relegation after an end of season relegation/playoff system was announced to expand the
Thai Premier League, and thus escaped relegation despite finishing 16th. In 2011, rebranded Army United signed five Brazilians and surprised all expectations as they topped the TPL in the early weeks of the season, with
Leandro Dos Santos scoring regularly. Crowds rose from a few hundred to a season average of 5,580. However, the early season form petered out and Army finished in 13th position. In 2012, most of the Brazilians had moved on but were replaced with other highly rated foreign stars.
Daniel Blanco was the most impressive performer as Army flirted with the Top 6 for long periods before eventually finishing in 10th position. The 2012 season also coincided with Army reaching the
2012 Thai FA Cup final. On the way to the final, Army was given a reprieve after they lost a penalty shoot-out to regional league side Trat. It turned out that Trat had fielded an unregistered player and was booted out of the cup with Army reinstated. Army United then defeated runaway TPL leaders
Muangthong United on the way to the final. However, Army lost the final 2–1 to
Buriram United. In 2013, the club signed a strategic partnership deal with Thai-owned English club
Leicester City. In 2019, Army United decided to dissolve the club, ending the history of the club after 103 years. ==Stadium==