 The platoon is ordered to take part in a war games/training weekend, but after Lance-Corporal Jones's van, recently converted to gas under Mainwaring's orders, breaks down after Jones accidentally pushes his bayonet through the roof of the van into the gas bag on the roof.They are towed by a steam roller.Out of control, the roller destroys the platoon's tents, as well as other equipment, angering Major-General Fullard who is in charge of the weekend exercises, and who is already cross with Mainwaring for previously refusing to cash his cheque at the bank, still under the impression that Mainwaring is a bank clerk.