[Question] Is there an idiom for bonding over shared trials/​trauma?

Is there a idiom or phrase which describes bonding or attachment, not between a victim and an abuser like in Trauma Bonding or Stockholm Syndrome, but between two or more victims: i.e. how would you describe two hostages who forge a friendship or deep connection based on their shared experience? (A common trope of TV show episodes to fast crystalize enemies into friends)

Specifically I’m wondering about a word where they were in the same environment, not sharing similar experiences.

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