Florence Pugh has said she formed a "tight sisterhood" with her Little Women co-stars - with even Timothee Chalamet becoming "so involved with all the girls".
The actress stars alongside Saoirse Ronan, Emma Watson and Eliza Scanlen in the forthcoming adaptation of Louisa May Alcott's 1868 novel.
Speaking to Glamour, the 23-year-old actress said: "We really were a tight sisterhood and we knew it had to be that way in order for it to be real and believable.
"Whether it's on or off screen, you'll never get anything like the power of that support system and that belief we had in one another.
"We were ready to go to war for one another. If one of us has something to say, then we all have something to say."
The film sees Oscar-nominated actress Ronan take on the role of Jo March, one of the four feisty March sisters each determined to live life on their own terms.
Call Me By Your Name star Chalamet takes on the role of the girls' neighbour Laurie in the film, set in post-civil war America.
Pugh said: "Timmy was so involved with all the girls. He was just as desperate to be a part of our gang as we were.
"He was instantly in with the jokes and the wrestling.
"Everything about that dynamic didn't feel like we were welcoming a boy - it was really wonderful."
For more movie news, click here