About the year 1599, in the city of Posen, a very remarkable incident took place in connection with the Blessed Sacrament. A servant girl, who was bribed by some unbelievers, stole from the chapel of the Dominicans three small Hosts, wrapped them in a linen cloth, and carried them to the house of the wretches who had hired her for the deed. The unbelievers treated the Sacred Hosts in a most sacrilegious and shameful manner. They threw them on a table and cut the Sacred Particles. Blood spurted out on the first one of the sacrilegious creatures and left a stain that could not be removed. The report of this strange occurrence soon spread abroad and crowds ran to see for themselves. A blind woman insisted on being led to the scene of this marvelous incident. Divinely inspired, she cried out: "If Thou art the true God, He whom our ancestors nailed to the Cross, restore to me my sight!" She was immediately cured, and went away proclaiming the miracle. The guilty profaners, fearing the just punishment of their heinous crime, wished to dispose of the desecrated Hosts, and after several fruitless efforts buried them to a great depth in a swamp.
One day on the octave of the Blessed Virgin, two herdsmen, father and son, brought their cattle to pasture near this place. The father went to a church not far off to hear Mass, while the son guarded the herd. To his surprise the boy saw the cattle approach the swamp and kneel down with their heads bent low. The shepherd raised his eyes and saw in the air over the swamp three shining objects. In amazement he perceived that they were three Hosts, and he instantly prostrated himself and profoundly adored the God who revealed Himself by so great a prodigy.
In the meantime, the father returned from Mass. As soon as the boy saw him he ran to meet him. "Father," he shouted, "our oxen are adoring the Blessed Sacrament!" "Nonsense!" replied the parent, shrugging his shoulders, "what folly is this!" "Come and see for yourself," protested the boy, "that I am telling the truth." While proceeding on his way the old man suddenly paused, with feet fastened to the ground and with eyes entranced as he beheld the astonishing scene. There at the farthest end of the marsh three little lights hung in the air, while the dumb beasts knelt with heads bowed to the earth. The old herdsman, all doubts gone, knelt in adoration before the three consecrated Hosts profaned by the unbelievers. After a moment's prayer, the old man ran to the city and proclaimed the wonder to all whom he met. The people, however, looked upon him as a fool, and even cast him into prison. And now a new wonder occurred–the prison door opened and freed the prisoner. This startled the authorities and they began to investigate. The Bishop and the clergy were informed and went in procession to the place indicated by the herdsman. Then the Sacred Hosts, which had remained suspended in the air, slowly descended and rested in the hands of a saintly priest. They were taken back to the city amidst great pomp and splendor. Then the authorities began to debate what disposition to make of the miraculous Hosts. While they were arguing, the Hosts rose from their hands, ascended into the air and returned to the marsh. The wish of Our Lord was evident. So they erected an improvised sanctuary on the spot, and this in turn was soon followed by a magnificent basilica founded by Ladislaus Jagellon, King of Poland. Needless to say, thousands of pilgrims have visited the famous shrine to adore the miraculous Hosts.