Pond of the blood

Near to my town there is specific place where there is old Masjid some of people told me its age over hundreds of years and this place has strange story many people told me this story specially my father law.
He told me in this place every year in specific time they found small pond of blood near to this Masjid and they attempted to cover it by mud but the blood appear again over this mud and he knew from his grandparents in this place has the remains of some of the companions of the Prophet.
Really i didn't believe that because i good reader for the history and i didn't read that about any battle happened near to my town or even some of the companions of the Prophet Mohammed killed in this place.
So i decided to research about that through many books which talk about the Muslims invasion to Egypt and how many battles happened through that.
Indeed i surprised when i found that when i read about small battle happened near to this place between the Muslims and Romans and this battle called Santawis battle where the Muslims won but there are seven companions of the Prophet killed in this place so the people who live in this place consider this event good because their land has remains of seven companions of the Prophet Mohammed.
They believe these bloods for these seven companions and these bloods come out from the land in this time which they killed in this battle.

Really i don't know if this right or wrong but this is fact and their perceptions about these bloods.