The former was not satisfied with the situation and on 23 January 1919 invaded the area while both parties were engaged in much larger conflicts elsewhere, Poland in its war against the West Ukrainian National Republic and Czechoslovakia in the war with the Hungarian Soviet Republic over Upper Hungary. The impetus for the Czech invasion in 1919 was Poland's organising of elections to the Sejm (parliament) of Poland in the disputed area. The elections were to be held in the whole of Cieszyn Silesia. The Czechs claimed that the polls must not be held in the disputed area, as the delimitation was only interim and no sovereign rule should be executed there by any party. The Czech demand was rejected by the Poles and, following the rejection, Czechs decided to resolve the issue by force. Czech units led by Colonel Josef Šnejdárek and Polish units commanded by General Franciszek Latinik clashed after the swift Czech advance near Skoczów where a battle took place on 28–30 January. It was inconclusive, and before the reinforced Czech forces could resume the attack on the town, they were pressed by Entente to stop operations and a cease-fire was signed on 3 February.