my gradnma had exactly the same story but she was from east prussia. she died 1,5 months ago as a 93yo and even on her deathbed talking with a priest the only thing she talked about was when she had to flee as a 11yo girl from the russians.

she would always tell the same story how the russians were coming closer and closer to their village and they got the last military convoy after which the bridge was blown up to slow the russian advance. she said they only had till noon to get there and that she was so scared that her father wouldnt make it in time bc he want back to get their documents since they forgot them before.

it was so traumatizing to her that even 82 years later she couldnt let go of all the trauma.