D-Day was supposed to happen on June 5, 1944. The story of why it ultimately took place on June 6 is one that has been a bit lost to history, consumed by the larger events surrounding it.

One day might not seem like much in the grand scheme, but it was a seismic delay in plans for the unprecedented and daring invasion, which would deploy nearly 160,000 Allied troops in Normandy. Ultimately it came down to a recommendation from a shrewd Scottish meteorologist, Group Capt. James Stagg, who had to tell everyone, including Gen. Dwight D. Eisenhower and the Allied leadership, something they didn’t want to hear: The weather was going to be catastrophically bad. And no, he wasn’t certain about it.

The tense 72 hours before the invasion are brought to life in “Pressure,” in theaters May 29, on the eve of the operation’s 82nd anniversary. An adaptation of David Haig’s acclaimed stage play, the film sheds light on this bit of history that would effectively change the course of the second World War.

The very different styles of Brendan Fraser and Andrew Scott

Filmmaker Anthony Maras assembled a unique group of actors for the task at hand, calling on Brendan Fraser to play Eisenhower and Andrew Scott to play Stagg.

“I didn’t think I was an Ike Eisenhower when Anthony Maras sent me the script,” Fraser said. “I got on a Zoom call and he said, ‘You gotta do this man.’ Me? Why? ‘It’s because he’s you, he’s like you. He’s just a regular guy.’ Really? I mean, I thought Eisenhower was this, you know, stern, staunch, something on coin.”

Fraser went deep in his preparation, reading and listening to everything he could get his hands on to help him understand the man who would ultimately have to make the decision. The research even continued on set. Maras laughed that right before they shot Eisenhower’s famous “soldiers, sailors and airmen” speech, something that they’d rehearsed many, many times, he looked up and saw Fraser reading yet another biography. But he appreciated that the Oscar-winner was passionate about knowing everything he possibly could to get it right.

“He cared intensely for his troops,” Fraser said. “It was my responsibility to honor their memory and to comport myself in a way that puts a human face on the seemingly academic decisions that go into an operation as massive as this.”

Scott was the opposite in terms of how he approached his role. Yes, he read Stagg’s book and wanted to have a working understanding of the metrological jargon he’d have to be spouting. While history was important, for him, character was king. And he liked that Stagg is not the most immediately likable person, but he has integrity.

“The thing with Stagg is that he’s just not interested in charm … or being liked at all,” Scott said. “I think that’s to be admired actually, because he’s just there to do a job. So I like the fact that at the beginning of the movie, you’re like, whoa, this guy is not pleasant.”

Maras said that for Scott, it was all about the inner, emotional life of the character — which was essential for a part that would require so much internal conflict.

“With Andrew, he has a quality to him where he can seemingly be doing very little — he’s sitting down, rearranging his tie, he can be reading a phone book — and you can’t look away,” Maras said.

In the shadow of ‘Saving Private Ryan’

The actors weren’t the only ones feeling pressure of the assignment: Maras also had a behemoth looming in attempting to stage, however briefly, the D-Day invasion.

“You’ve kind of got to be crazy maybe to attempt it, given that Spielberg did it so masterfully,” Maras said.

But unlike “Saving Private Ryan,” which focused on the men storming the beach, “Pressure” is about the ones making the decisions. It’s a different perspective. Still, once they make the call to go, there would have to be at least some of the operation shown to juxtapose with the “bloody tense, wire-type atmosphere of the control room,” Maras said.

Inspired by Peter Jackson’s World War I documentary “They Shall Not Grow Old,” and the existence of dozens of hours of pristine 35 mm black and white film from the event, Maras decided that perhaps archival footage, colorized, would be the way to go. It was a different way to present D-Day that gave it immediacy, he said, as opposed to looking like history.

‘Pressure’s’ relevance to today

Ultimately, “Pressure” isn’t just a history lesson, or even a character drama with big personalities and even bigger stakes: It’s a portrait of leadership and ego clashing with facts and science. And its relevance to the present day is the reason Maras wanted to make the film in the first place.

“How do you bring your best self to the table to make the decision? How do you have the humility to acknowledge when you don’t know something? And how do you have the wisdom to determine who to trust? … Eisenhower in the end showed that he was a maestro at that,” Maras said. “What I love about the Stagg character is he’s someone who feels compelled to tell someone something that they don’t want to hear, that they violently don’t want to but they need to hear. The world needs more of that.”

Years later, John F. Kennedy, on the way to his own inauguration, asked Eisenhower what gave them the edge on D-Day. His response? “We had better meteorologists than the Germans.”

“When life or death depends on you understanding the facts, it probably has a way of like cutting up the BS and getting to it,” Maras said. “It’s a very clear example of a time where the Allied worlds’ future was at stake and they listened to someone who knew what he was talking about and they did all right.”

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