The Guns Of Navarone is based on the events of World War II. The Axis powers are intimidating Turkey to join them in their fight against the Western countries. Meanwhile, 2,000 British soldiers are marooned on the island of Keros. The Royal Navy is unable to perform a rescue mission because of a large number of guns situated on a nearby island named Navarone. The guns are radar-directed and attack British ships at sea. The Germans plan on assaulting the British forces on the islands. A previous attempt to destroy the guns on Navarone had failed. A team of Allied commandos sail to Navarone in their attempt to destroy the guns themselves.
Disguised as Greek fishermen, the commandos seize a German boat and eventually kill all on board before sinking it. After their ship is wrecked by the storm, they lose some of their equipment. However, they reach the island without incident. They climb a cliff, which was thought to be impossible to climb. Franklin, one of the commandos, is injured and later falls ill due to infection. The group find out that the cliff is guarded. Mallory, the leader of the group, tells the two guards to care for Franklin while the others continued on their mission. The group is later captured by German soldiers.
Meanwhile, Franklin receives treatment and gives the Germans false information. The units deploy in the direction away from the guns. The explosives set in place to destroy the guns were deemed useless. Miller, a corporal in the commandos, discovers that a German saboteur was behind the sabotage. The saboteur was eventually killed.
Mallory and Miller continue to attack the guns while two of their fellow commandos distract the people of a nearby town. The duo make their way towards the guns. After a battle with the Germans, the guns are destroyed with the leftover explosives.