In those years, the clubs had difficulty retaining members, as a large part of the population worked outside in the Biesbosch National Park and were away from home for weeks.

The name was chosen as a tribute to the "Kozakstoep", a local site along the Merwede where the football club often played its matches.

The site owes its name to the Don Cossacks, who crossed the Merwede River at that place in 1813 as they freed Werkendam from French occupation during the Napoleonic Wars.

[2] Until the Second World War, Kozakken Boys played within the amateur divisions of the Brabantsche Voetbalbond (BVB) and later the KNVB.

In the end, Spakenburg won the overall Saturday title in the last minutes which a 3–2 score, after a half-hour delay, while two players from both teams were sent off.

[8] The 2009–10 season ended in 8th position, which meant promotion to newly introduced top amateur level, the Topklasse, was not achieved.

The regular season in the Hoofdklasse B group ended in 2nd place, missing the league title by one point behind SVV Scheveningen.

[9] The initial disappointment was quickly overcome by winning the KNVB District Cup South I for the first time in club history.

Under the leadership of coaches Arie Schep, Danny Buijs and Ton Cornelissen, the club won the Topklasse Saturday.

Kozakken Boys were eventually knocked out by Eredivisie club AZ, who beat them 1–3 by deciding the game in the final 10 minutes.

[13] From the 2016–17 season, the KNVB revived the formerly defunct Tweede Divisie, with the top seven clubs from the 2015–16 Topklasse Saturday automatically qualifying.

In the first round, Kozakken Boys had managed to win 3–0 over second-tier Eerste Divisie club Helmond Sport on 20 September 2016.

At a packed Sportpark de Zwaaier, thanks to goals from Raily Ignacio, Gwaeron Stout and Everton Pires Tavares delivered a win.