In the city of Poznan, profaners with an intense hatred for the Christian faith persuaded a domestic helper to take three consecrated Hosts from the Dominican (now Jesuit) church. The woman, enticed by a large reward, succeeded in stealing three Hosts. Immediately after they received the Hosts, the malefactors went to the basement of their mansion, put the Hosts on a table and desecrated the Eucharist, piercing the Hosts with pointed instruments. Suddenly, a copious amount of Blood began to drip from the Hosts, which splashed the face of a girl afflicted with blindness, and she immediately regained her sight.
The desecrators, seized with panic and anxiety, tried to destroy the Hosts, which nevertheless remained whole. Unable to rid themselves of the Holy Eucharist, they decided to take the Hosts outside the city and cast the Sacred Species into a marsh in the vicinity of the Warta River.
A young shepherd who happened to be passing near the marsh saw the three luminous Hosts suspended in the air. Holding back his emotions, he returned home and recounted everything to his father and the local authorities. The burgomaster was indifferent to the young man's account and ordered him to be jailed. The young shepherd managed to mysteriously escape and again presented himself to the burgomaster, who finally convinced of the facts, made his way to the place of the miracle.