Whilst the suspicious Flick and his henchman Von Smallhausen dig their own tunnel into the camp,the prisoners are planning a mass escape. Von Strohm volunteers Geering as the first to go and he is catapulted over the wire and spirited away into the woods by the Resistance. Gruber dresses as a nun in order to get into the camp to free the others but they take advantage of an entertainment about to be staged and dress up as dancing girls.
Flick and Von Smallhausen tunnel their way into the camp, only to find that, along with Gruber, everybody has escaped disguised as dancing girls. Flick intercepts Rene's call to London but Rene, realizing this, destroys his radio. The Resistance now have no radio. Nor do they have Maria, who disguised herself as a Red Cross parcel, but, due to insufficient stamps, was sent back to Switzerland. Geering has also gone, since the Resistance assumed he was an escaping British officer and took him to London, where he now has an office in Piccadilly Circus.
To replace Maria,Michelle brings in Mimi Labonq,who is very tiny but very tenacious and vows to be Rene's bodyguard. She is also very fanatical and Rene has to stop her from poisoning Flick. A new radio is also brought to the cafe by Roger LeClerc but this coincides with the arrival of Geering's replacement,the Italian Captain Bertorelli. He too almost falls victim to Mimi when he misunderstands her invitation to go upstairs and look at some paintings.
Flick suspects Von Strohm and the general of being part of a plot to kill Hitler and plants a microphone,disguised as a daffodil,in the general's office but the only conversation is the Germans trying to get rid of Bertorelli. The Resistance need an aerial to be placed above Flick's jamming signal to block it out so Mimi,dressed as a nun,is sent up in the air attached to a box kite. She asks London to send explosives. Alphonse catches Rene and Yvette at it and regards Edith as back on the market.
The Resistance are awaiting batteries,stolen from the Germans,to operate the wireless under the bed and,in the meantime,Michelle has Rene and Yvette pedalling a bicycle attached to a generator to power it. Helga exposes Flick's efforts to bug the general's office and Von Klinkerhoffen has him arrested. Gruber completes his forgery of the painting and delivers it wrapped up in a sausage. However it gets mixed up with real sausages and ones containing batteries and explosives.
The British air force drops a spy camera with which the Resistance are to photograph the plans for the German invasion of England. However the camera lands in Alphonse's vineyard,which Von Klinkerhoffen has commandeered. When he orders the locals to harvest the grapes the camera is rescued and two attempts made to kill the general. One involves poisoned wine but Alphonse ends up with the glass and spits out the wine.The reserve plan has explosives hidden in Madame Fanny's wheelchair but this too goes wrong and the wheelchair goes whizzing across the countryside.