During the civil war between Boleslaw III and his brother Zbigniew, Coloman intervened on the former's behalf and helped him overcome the latter's army in Mazovia in 1107.
Selama perang saudara antara Bolesław  III dan saudaranya Zbigniew, Kálmán campur tangan atas nama mantan dan membantunya mengatasi tentara terakhir di Mazovia pada tahun 1107.