The topic of this film is the first battle of WWI that was won by the allies, when small and outnumbered army of Serbian Kingdom defeated Austro-Hungarian invading forces. The plot revolves around a small artillery section, the men and their lives. The cast was excellent and they did their job superbly. Historically, battles of Drina and Cer, in Serbia, were the first two victories in WWI. Unfortunately, overwhelmed by the invaders, Serbian army had to retreat all the way to Greece and wait there until the allies were ready to open the front at Solun. If you've seen Gallipoly, you should see this film as well.