In the 17th century, Catholic Poland was invaded by Protestant Sweden. Nothing could stop the invaders, until one day, when a Polish garrison of 170 soldiers, 20 officers and 70 monks of a fortified monastery devoted to the Virgin, held the 5,000- men strong Swedish army in check.
This Swedish defeat enabled the King of Poland to regain control of his whole kingdom. After his reconquest of the country, King John II Casimir consecrated Poland to Our Lady of Jasna Góra, "Queen of Poland" in 1656.
Later, after World War I, Poland’s independence was again in jeopardy. Indeed, in 1920 the immense Russian Soviet Red Army invaded the country. The episcopate met at Jasna Góra and renewed the consecration of Poland to the Virgin.
And so, in the same year, in August 1920, the "Vistula miracle" took place during the Battle of Warsaw (Poland) which opposed the enormous Russian Bolshevik army to the small Polish army and saw the crushing of the Bolsheviks by Poland.
Translated from the French – Source: Wordpress