This is a story about the soldiers of a cannon battery in the First World War who, like hundreds of thousands of others, made the glory of the Serbian army immortal. Some of them were young men for whom this was the first war, as it is the case for the main character Stevan, a newly graduated biology student when his father accompanies him to the war not knowing if he would ever see him again; other warriors already hardened by the war and yet only peasants who will think of their families and native fields in moments of respite. Gathered from all sides of Serbia and infinitely different, through all the difficult days and battles, they become one in the defense of their homeland. This is a story of their heroism and friendship, a story of harmony and brotherhood without which none of them would have survived. Only one of them survived, and this series is his memory of comrades-in-arms, as well as the memory of half a million Serbian soldiers killed in the First World War, over whose graves a small blue flower, gentian, blooms to protect them since destiny and history failed to do that…