It’s worth recalling that even a decade after the war concluded, there remained a desire—perhaps even a requirement—for narratives about wartime experiences that highlighted (and often exaggerated) the accomplishments of everyday individuals who participated in the conflict. This motion picture falls into that category. While rooted in actual incidents and people, it remains a dramatization. The filmmakers do take some liberties with historical accuracy; however, the inclusion of bouncing bombs—ingeniously created from nothing, or at least with some assistance from Napoleon—by Barnes Wallis (Michael Redgrave) to demolish three German dams along the Ruhr River by a squadron commanded by Wing Commander Guy Gibson (Richard Todd) is accurate. The film slowly reveals the difficulties encountered during bomb testing, showcases the commitment of those responsible for delivering them, and naturally, illustrates the danger confronted by the aircrews—many of whom did not survive. I watched this on television recently, and the announcer offered a preemptive apology for “racist language,” which I presumed was in reference to Gibson’s dog. It's peculiar that an apology wasn't extended regarding the depiction of widespread destruction caused by both sides. This is a curious modern-day contrast made possible by the actions and achievements that this film intends to honor.

Source on TMDB