At a business community function, where both Wilson and Walker outshine him, Captain Mainwaring accepts a challenge to prove his men are a match for the Home Guard's new, regularly trained, physically superior commandos. Their display of 'brains over brawn' should eliminate the commandos-guarded fuel depot by getting a fake bomb there. A far-fetched plan, dressed up as firemen, ends in the usual brave bumbling from the braves and the for once collaborating verger. Surprises come from a real fire and real brains.
—KGF Vissers