Have heard about it twice from completely different sources and is not something that would be randomly made up. When did this event happen/how did it happen?
While we wait for a historian to answer your question, here is another 2 threads that were posted about this period in Polish Lithuanian Commonwealth history often dubbed "The Deluge"
https://www.reddit.com/r/AskHistorians/comments/6apkyv/can_someone_give_me_an_understanding_of_the/
https://www.reddit.com/r/AskHistorians/comments/nbew9f/the_period_16481665_was_arguably_the_most/