The Nordist Major State has decided to look after the forces of the Southern General Early. For this purpose the Nordist Generals will use without their knowledge Sergeant Chesterfield and Corporal Blutch by drawing up a false battle plan in front of them. Thinking that Blutch would be the most able to disclose these false plans to the Southerners, he is promoted Lieutenant, to the greatest dam of Chesterfield. Then everything is organized so that they will fall into the hands of the Southerners as soon as possible. If Blutch is not fooled by the intentions of his superiors by taking them as men of straw, the naivety and patriotic principles of Sergeant Chesterfield will make the plan bankrupt. Some heroes are sometimes more dangerous than the enemy...