He returned to his lawful allegiance in the following year and assisted Czarniecki in his difficult task of expelling Charles X.
He had already (1665) succeeded Czarniecki as acting commander-in-chief.
STEPHEN CZARNIECKI (1599-1665), Polish general, learnt the science of war under Stanislaw Koniecpolski in the Prussian campaigns against Gustavus Adolphus (1626-1629), and under Wladislaus IV.
Of Sweden invaded Poland in 1655, Czarniecki distinguished himself by his heroic defence of Cracow, which he only surrendered under the most honourable conditions.
On the conclusion of the Peace of Oliva, which adjusted the long outstanding differences between Poland and Sweden, Czarniecki was transferred to the eastern frontier where the war with Muscovy was still raging.
Czarniecki is rightly regarded as one of the most famous of heroic Poland's great captains, and to him belongs the chief merit of extricating her from the difficulties which threatened to overwhelm her during the disastrous reign of John Casimir.
Czarniecki raised partisan-warfare to the dignity of a science, and by his ubiquity and tenacity demoralized and exhausted the regular armies to which he was generally opposed.
See Ludwik Jenike, Stephen Czarniecki (Pol.) (Warsaw, 1891); Michal Dymitr Krajewski, History of Stephen Czarniecki (Pol.), (Cracow, 1859).
The second event, which began with the heroic and successful defence of the monastery of Czenstochowa by Prior Kordecki against the Swedes, resulted in the return of the Polish king from exile, the formation of a national army under Stephen Czarniecki and the recovery of almost all the lost provinces from the Swedes,.
Its last manifestation was the successful defence of the monastery of Czenstochowa by Prior Kordecki against the finest troops in Europe, its last representative was Stephen Czarniecki, who brought the fugitive John Casimir back from exile and reinstalled him on his tottering throne.
Charles X., in his thirty-eighth year - all this has elsewhere been described (see Charles X., king of Sweden; [[Czarniecki [Stephen]]]; FREDERICK III., king of Denmark).