In the Škoda factory, where they are feverishly rearming in 1914, works the foreman Kalina, the father of the young men Pavel and Jan. Pavel is a supporter of the monarchy, while Jan, on the contrary, defends the idea of ​​our national independence. Just before mobilization, Jan escapes to Russia, where he joins a group of volunteer legionnaires called the "Czech Company", fighting against the Austro-Hungarian monarchy. Pavel enlists in the Austrian army. The brothers do not meet again until July 1917 in the battle of Zborov in Ukraine, which marked a successful breakthrough of the Austro-Hungarian front.