During World War II, Winnie Potter gets angry at her fiancé, Jerry Walker, when he sneaks sweets to her clients at a fat reducing farm, the strict diet of which includes plenty of milk. Jerry, a private in the Army, has delayed their wedding for eight weeks because he is always getting into trouble. As he is returning to Camp Arthur, three clients of the farm, Cornelia Pigeon, Nancy Collister and Maggie Watson, try to interest him in getting two other soldiers to become their dates for a day. All three women suspect that their husbands are not really away on a fishing trip, but are philandering behind their backs, and decide that making them jealous is the best revenge. Jerry rejects the matrons' offer, and then accidentally crashes his jeep through the canteen wall at the camp. After Sergeant Wiggins tells him that he has to come up with the money to pay off the damages or spend six months on guard duty, Jerry meets with Cornelia, Nancy and Maggie again and agrees to meet them at Cornelia's Southhampton, Long Island, home on Sunday. He then cancels his Sunday wedding plans with Winnie, and arranges with his best buddies, Frankie Burns and Barney Hilliard, to join him on Sunday, intending to pay them twenty dollars out of the $300 the women are to give him. In order to slip out of camp, Jerry fakes a head injury while working on the jeep. Winnie, meanwhile, has figured out that Jerry is not going on special assignment, as he told her, but is having a rendezvous with the matrons. Frankie and Barney, who have been told they are being fixed up with real beauties, are shocked when they meet the matrons, and try to renege on the deal, but Jerry insists they remain. Terrified of any physical contact with the women, the three men become inseparable. Maggie then demands the return of her $50 deposit, which Jerry has already given to Winnie, but she is interrupted when Winnie arrives with Muriel and Jean, Frankie and Barney's girl friends. The angry girl friends break off all relations with the soldiers, who decide that they may as well keep their deal with the matrons. Not long after, the husbands arrive with their dates, who quickly exit after the wives make their presence known. After several arguments, Jerry, Frankie and Barney go to the local nightclub with Maggie, Cornelia and Nancy. Winnie, Muriel, Jean and the husbands decide to do the same, and each group tries to outdo each other in making their mates jealous. When Jerry discovers Sergeant Wiggins at the booth next to his, he pretends that his head injury has caused insanity, which is why he never made it to the Army hospital. Jerry, Frankie and Barney then escape in a rowboat, intending to row across the sound to the camp, but a periscope shoots up through their boat and they are unexpectedly affixed to a German submarine. When the German commander realizes he has three Americans on board, he heads the submarine for open ocean, but Jerry fools him into thinking he is headed for the shore by holding a mirror in front of the periscope lens. The commander turns the submarine around and heads for shore. The submarine crashes on the beach, and the Germans spies are captured. A year later, Jerry is once again in the brig for causing trouble, and his patient wife Winnie bids him a cheerful farewell with their baby son in her arms.