The movie opens with German children's song "Hänschen klein" mixed with black-and-white footage of prewar and war scenes. It then segues to color and a German platoon raid on a Russian forward outpost led by Sergeant Rolf Steiner (James Coburn), during which his men capture a young Russian boy-soldier (Slavko Štimac).
When Stransky meets Steiner for the first time, he orders Steiner to shoot the boy prisoner in strict observance of a standing order. When Steiner refuses, Stransky prepares to shoot the boy himself, but at the last moment, Corporal Schnurrbart (Fred Stillkrauth) saves the boy by volunteering to do it. Later, Stransky informs Steiner that he has been promoted to Senior Sergeant, and is puzzled by Steiner's nonchalant response. Stransky also discovers that his adjutant, Lieutenant Triebig (Roger Fritz), is a closet homosexual when Stransky surreptitiously sees Triebig stroking the cheek of an enlisted orderly, Josef Keppler.
While waiting for an anticipated attack, Steiner releases the young Russian, only to see the boy killed by advancing Soviet troops. As Stransky cowers in his bunker, Lieutenant Meyer (Igor Galo), the respected leader of Steiner's company, is killed while leading a successful counterattack. Steiner is wounded in the same battle trying to rescue a German soldier and is sent to a military hospital to recover. There, he is haunted by the faces of the dead men and the boy (in a dream sequence prior to waking from a coma), and has a romantic liaison with his nurse (Senta Berger).
After he has recovered, Steiner is offered a home leave but decides instead to return to his men. When he arrives, Steiner is informed that Stransky has claimed that he led the successful counterattack, not Meyer, and has been nominated for the Iron Cross. Stransky named as witnesses Triebig (blackmailing him with his homosexuality), and Steiner. Stransky tries to persuade Steiner to corroborate his claim by promising to look after him after the war. Brandt questions Steiner in the hope that he will expose Stransky's lies, but Steiner only states that he hates all officers, even those as "enlightened" as Brandt and Kiesel, and requests a few days to ponder his answer.
When his battalion is ordered to retreat, Stransky does not notify Steiner's platoon, abandoning them. Making their way back through now enemy territory, the men capture an all-female Russian detachment. While Steiner is busy, Zoll (Arthur Brauss), a despised Nazi Party member, takes one of the women into the barn to rape her. She bites off his genitals and he kills her. Meanwhile, young Dietz, left to guard the rest of the women alone, is distracted and killed as well. Disgusted, Steiner locks Zoll up with the vengeful Russian women, taking their uniforms to use as a disguise.
As the men near the German lines, they radio ahead to avoid friendly fire. Stransky suggests to Triebig that Steiner and his men be 'mistaken' for Russians. Triebig orders his men to shoot the incoming Germans; only Steiner and two others survive. Triebig denies responsibility, but Steiner kills him and goes looking for Stransky.
At this moment, the Soviets launch a major assault. Brandt orders Kiesel to be evacuated, telling him that men like him will be needed to rebuild Germany after the war. Brandt then rallies the fleeing troops for a counterattack. The same children's song plays again, until the final credits.
Steiner confronts Stransky and, instead of killing him, offers him a weapon in order to see "where the crosses of iron grow". Stransky accepts Steiner's "challenge", and they head off together for the battle. The film closes with Stransky trying to figure out how to reload his MP40, while being shot at by an adolescent Russian soldier who resembles the boy-soldier released by Steiner. When Stransky asks Steiner for help, Steiner begins to laugh. The laughter continues through the credits and pictures of civilian victims from World War II and later conflicts.
Cross of Iron, Sam Peckinpah's only war film, "is a forgotten masterpiece that has never really managed to overcome its troubled and expensive production." While Peckinpah had directed "many films about battles between groups of armed men...this was the first in which both sides wear uniforms."
In the opinion of Filmcritic.com, "Peckinpah indulges in endless combat scenes (this was his only war movie), which try the patience of viewers who came for the real story." Critical opinion has since improved and Cross of Iron was voted the greatest film ever made by Cinemag. Fans of the film include Quentin Tarantino, who used it as inspiration for Inglourious Basterds.
According to Variety magazine, "the production [from the book by Willi Heinrich] is well but conventionally cast, technically impressive, but ultimately violence-fixated."
Orson Welles, when he saw the film, cabled Peckinpah, praising the latter's film as "the best war film he had seen about the ordinary enlisted man since 'All Quiet on the Western Front'." Ian Johnston, reviewing the film's release on Blu-ray in June 2011, praised the film, saying Cross of Iron bears all the hallmarks of a real classic, which ranks with Peckinpah's finest work. As a poignant reminder of the sheer brutal obscenity of war, it has rarely been equalled."
At the time of its release, the film did poorly at the box-office in the US and received mixed reviews, its bleak, anti-war tone unable to get noticed amidst the hype of the release of the mega-popular Star Wars in the same year. However, it performed very well in Germany, earning the best box-office takings of any film released there since The Sound of Music and audiences and critics across Europe responded well to the film.
The film is noted for featuring realistic gear and equipment such as Soviet T-34/85 tanks (which were obtained from the arsenal ofYugoslav People's Army that kept them especially for cinematographical purposes) and German weapons such as MG 42s andMP40s. But according to star James Coburn, although the Yugoslav government promised that all the military equipment would be ready for the start of filming, considerable delays occurred when half the equipment was missing just as the production was about to begin.
The film Breakthrough, which was mostly financed by West German producers, was released in 1979. It was made by Anglo-American director Andrew McLaglen who, like Peckinpah, was known for Westerns. Several changes were made to the sequel, for instance the action was moved from Russia to the Western Front and Richard Burton replaced Coburn as Sgt Steiner. Breakthroughwas panned by critics, who criticised it for a confusing plot, poor dialogue, aged cast and undistinguished acting. The film involved Steiner saving the life of an American officer (Robert Mitchum) and a conspiracy to assassinate Adolf Hitler.