Did the Cossacks bathe on Epiphany in a pit?

There was such a thing in the history of Cossack Ukraine.
Zaporizhia Cossacks, during the celebration of Ordany (Baptism), used their rifles and cannons to shoot at the "unholy force", which seemed to emerge from the water at the very moment when the priest lowered the cross into the water!
And did the Zaporizhia Cossacks bathe in a mud pit?
Does the baptismal water wash away sins?
And how did the tradition of bathing in a well on the feast of the baptism of the Lord enter our culture?

Let's consider this issue in more detail in this video.