The Great War gets bogged down in the trenches, hundreds of young pilots prepare to defend their homeland and quench their thirst for adventure, but the beginnings are laborious everywhere. With Verdun, mastering the skies becomes essential.

In the spring of 1917, the United States enters the war, and the Battle of the Skies reaches a turning point. The Germans change tactics when they start to fly in groups, and solo flights come to an end.