They compete in the III liga, the fourth division of Polish football, and play their home matches at the Legia Training Center in Książenice.

In 1952, the club surprisingly reached the final of the Polish Cup, previously eliminating Lechia Zielona Góra II (6–2), Naprzód Lipiny (2–1), ŁKS Łódź (7–1), Górnik Zabrze (2–1), Ruch Chorzów (2–1) and Wisła Kraków (0–0, 1–0).

[10] In the 2019–20 season, Legia II reached the 1/8 finals of the Polish Cup (previously eliminating higher-ranked teams of Wigry Suwałki and Odra Opole), where they were defeated by Piast Gliwice (0–2).

[13] In the 2022–23 season, Legia II successfully defended the Polish Cup at the Mazovian level, winning 3–0 against Pogoń Grodzisk Mazowiecki in the final.

In the next round, after overtime, it suffered a loss to another representative of Poland's top league, Korona Kielce, effectively dropping out of the competition in the 1/16 finals.