Since Maria's disappearance, the café needs another waitress, but René and Edith has somewhat different ideas about who should fill the position, but finally Michelle from the Resistance brings tiny Mimi from another cell, to be René's bodyguard. In the meantime, General von Klinkerhoffen gives the Colonel a new assistant, Italian liaison Bertorelli.

There is still no batteries for the wireless radio underneath the bed of René's mother in law, so Michelle's newest hairbrained scheme is to have René and Yvette powering the radio with the generator from a bicycle until the stolen batteries from a German midget submarine are delivered. The Lieutenant is finished copying the paintings (The Fallen Madonna and the Van Gogh), and delivers them as sausages. Sausages also comes from Captain Bertorelli (real ones), Monsieur Leclerc (submarine batteries), and Officer Crabtree (explosives), and soon they're all mixed up in the German officers pants.

The Germans arrest René, and the Colonel demands an explanation for the knockwursts with explosives in them. After a small lie, René is sent home with around a dozen knockwursts to hang in his kitchen. Meanwhile, the British have sent a spy camera with which the Resistance should be able to photograph the plans for the German invasion of Great Britain, but the camera landed in the vineyard of Monsieur Alphonse's, and since the Germans commandeered the vineyard, the Resistance cannot go and look for the camera. This problem is solved when the General orders every peasant in Nouvion to work on the vineyard, which also leaves room for some assassination attempts on the General's life.

Dressed as girls from the Folies Bergère, the entire gang (the staff and the Germans) escape from the prisoner of war camp, and completely against plans bring the two British airmen with them. Outside again, the Colonel finds that the Captain is missing, only his glasses are found. Herr Flick and von Smallhousen intercept a message from London and try to send their own message, but René catches on and tosses the radio out the window, which leaves the Resistance without a means to contact London, until Michelle thinks of the radio in Lieutenant Gruber's little tank.

The Gestapo suspects that the Colonel and the General are in on a plot to assassinate Hitler, so Herr Flick goes undercover as Private Irma Von Kinkenrotten and plants a somewhat bizarre daffodil-shaped microphone in the Colonel's office, where Gruber and Von Strohm are making plans to get rid of Bertorelli in some way. Meanwhile, as Edith prepares for her wedding, René & Co. must get the aerial for their new radio above the jamming signal of Herr Flick, so they disguise Mimi as a small nun to obtain a box kite which they fly to contact London and request plastic explosive to blow up the safe in the General's chateau to get the British Invasion plans.

Having been trapped in the POW camp, René is enlisted in the plan to re-dig the tunnel, by getting rid of the dirt. Hans and the Colonel are playing cricket, though not very well, and Herr Flick and Von Smallhausen are digging their own tunnel into the camp. Monsieur Alphonse arrives at the café to report to Fanny the news that René has been captured, but René and Company join in on the British prisoners' plan to escape – though only one person can escape in this way. Meanwhile, Helga reports the situation to Gruber, and together they decide on a plan to rescue the Colonel, the Captain, and René, involving Gruber dressing as a nun.