Force 10 from Navarone (released in 1978) - Robert Shaw, Edward Fox, Harrison Ford, Carl Weathers, Barbara Bach, Franco Nero and Richard Kiel

This movie is a sequel to the highly popular 'Guns Of Navarone' and is loosely based on Alistair MacLean's novel of the same name. Directed by Guy Hamilton and stars Robert Shaw,Edward Fox, Harrison Ford, Carl Weathers, Barbara Bach, Franco Nero and Richard Kiel.
Miller and Mallory are back from Navarone and are sent on a mission to Yugoslavia to assist the war efforts and to neutralize a spy who escaped from Navarone. The German spy Nikolai is posing as Captain Lescovar and has infiltrated the Partisans and is undermining the war efforts of the allies in Eastern Europe. They join effort with the Force 10 unit headed by Captain Barnsby. They are air dropped over Yugoslavia and are captured by the Germans and their allies the Chetniks lead by Captain Drazak.
Drazak brings them before Captain Schroeder and the prisoners present themselves as Allied deserters who were court martialed. Schroeder is skeptical and opens their suitcase which is supposedly filled with Penicillin. To their surprise the suitcase contains wooden logs and they concoct a story about burying it on their way to capture. So Schroeder sends Mallory and Barnsby along with his trusted lieutenant Maritza and two other soldiers to retrieve the Penicillin. Maritza proves to be a partisan spy, and helps them to escape and meet Colonel Petrovich, the Partisan leader. Here Mallory recognizes Captain Lescovar and informs Petrovich about the spy. But Petrovich is not impressed and informs Mallory that the spy Nikolai was killed by himself. He asks them to focus on destroying the bridge to avoid attack by the German forces.



Mallory informs Petrovich that Miller is the real explosive expert and is held captive by the Chetniks. He forms a plan to rescue them along with Maritza. They infiltrate the camp and help Miller and others to escape. Miller informs them that the bridge is impregnable to explosives, but the force of tons of water from the dam nearby could do the trick. So Force 10 plans to destroy the dam instead and ask for supplies. But a sabotage by Lescovar foil the plan and Maritza is killed before she can stop him.
Miller and co plan to raid the German Yard for explosives while a dejected Petrovich plans to return to the head quarters. A daring raid which is suicidal in its planning with a spy Lescovar thwarting their actions is hell enough but the team is successful in the end. Lescovar is killed by an enraged Barnsby and they leave to destroy the dam. With German forces closing on them the bombs are set at a short fuse which makes their survival doubtful. But as they walk away the bombs detonate bringing the dam and the bridge down washing down the enemy hopes. The protagonist trapped on the wrong side of the river start the perilous journey home through enemy lands.
The movie was a box-office and critical disaster and even Ford is said to have disliked his role. I would prefer the book which has better action sequences compared to the insipid sequences in the movie. Just watch it to complete the Navarone Saga.