The 32-year-old actress will play a war correspondent in the upcoming movie, which will be overseen by First Look Media, and will also assist in producing the film, reported Variety.
And the British beauty is honoured she has been selected to appear in the movie and work with a "talented team of producers".
"I'm so excited to bring Kate Webb's remarkable story to the screen. Her integrity, curiosity about the unknown and tenacity set her apart from many other journalists of her time and ultimately saved her life," Mulligan said.
The plot will follow the true life story of journalist Kate Webb, which has been detailed in her own text "On the Other Side: 23 Days with the Vietcong", who reported on the Vietnam war, was caught, held captive for 23 days, but eventually survived the "most harrowing experiences".
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