The film depicts the events that occurred on the first day of the landing in Normandy. The so-called longest day is the film simultaneously describes the ins and outs of the historical battle of the Normandy landing from both the perspective of the Allies and the Germans, as well as the important reactions of both sides during this period. The technique is simple and the scene is realistic, allowing the entire event to be reproduced in front of the audience. There are some details in the rough, both the general making the decision and the soldiers landing, all write vividly: British warplanes flew over and attacked at low altitude; American special forces were fired at by the Germans; a group of French nuns braved a hail of bullets to rescue wounded coalition soldiers...