 In constant struggle with problems, at the end of the second decade of the 20th century, the club was neck to neck with the best Belgrade clubs, BSK and SK Jugoslavija, and in 1929 Soko made started their first triumphs.In the same year, they also successfully played against other Yugoslav First League clubs from Zagreb, Građanski, HAŠK, Concordia, and in Split, in the same year, they defeated Hajduk as well.It was the first defeat of Hajduk on its own playing field and in front of its own public by another club from Yugoslavia.