In a small British town during World War II, a group of elderly men forms part of a local defense unit known as the Home Guard. These "soldiers" are mostly retirees, groups of neighbors, and a couple of enthusiasts who, despite their limited training and questionable skills, are determined to protect their home from any threat, even a potential Nazi invasion. Captain Mainwaring, a somewhat arrogant but good-hearted man, is in charge of leading this peculiar group, often dealing with their egos and incompetences.