Ale największego podziwienia w takim Panu, i przy takiem szczęściu cnota jego i pobożność godna; kiedy co Sobotę do spowiedzi i komunji Ś. przystępował, mszy Ś. codziennie słuchał, i od niej choć mu też znać dawano, że tuż nieprzyjaciel dogania, oderwać się nigdy nie dał. Przed każdą batalią noc na modlitwie prawie całą przepędził, na gołej ziemi przy łóżku się porzuciwszy sypiał, w dzień zaś batalji nic nie jedząc ani pijąc, wpadłszy do namiotu , czy to kańczukiem czy paskami od szable, czy ostrym cierniem okrutnie az do krwi ciało swoje krajał...
English wikipedia has an article on the battle: Battle of Kircholm - Wikipedia but I intended to show by quoting contemporary sources its Catholic dimension (as Jan Karol Chodkiewicz - Ruthenian by his origins, Lithuanian by his citizenship, imbued in the Polish culture because of the Polish-Lithuanian Commonwealth was deeply Catholic). He prayed many hours and listened to the Holy Mass before each battle and, perhaps, never lost even one. He died during the huge Siege of Chocim (today Khotyn Ukraine) by the Turks in 1621 (which ended with the retreat of the forces of Jihad from Polish borders).
You must be aware of some "mainstream history" flaws in the commentary - for example Sweden became Protestant just few decades before the events - due to the usual run for Church property. Even wikipedia admits that "the process [of the Protestant Revolution] was slow and was not definitively decided until the Uppsala Synod of 1593, in the wake of an attempted Counter-Reformation during the reign of John III (1568–1592)." Reformation in Sweden - Wikipedia Of course, as in England and Germany, new Protestant elites wanted to keep the spoils. Thus, they rebelled against their lawful king - Sigismund who was also the king of Poland, supporting his Protestant uncle. PS Later, in the 17th century (Thirty Year War and the Northern War) Sweden (with money of Jewish financiers residing in Holland, and, unfortunately the help of France) became a sword of fighting Protestantism, saving the revolution and, most unfortunately opening the way to the final ruin of the Christendom and to the present world order.