In 1648 John Casimir was elected by the Polish Parliament to succeed his half-brother on the Polish throne. The reign of the last of the Vasas in the Polish–Lithuanian Commonwealth would be dominated by the Russo-Polish War (1654–67), followed by the war with Sweden ("The Deluge"), the scene for which had been set by the Commonwealth's two previous Vasa kings. Most of Poland was invaded by the Swedish army during the Deluge without much of a fight, due to the conspiratorial complicity of Polish and Lithuanian governors and nobility. In the course of a few years, the Commonwealth rose to force the Swedes out of Poland, ending the short-lived intrusions and campaigns, however, at a high cost. Most of the cities and towns in the Commonwealth were sacked, plundered and some were burnt to the ground, mostly by the retreating enemy units. Although the reign of John Casimir is remembered to be one of the most disastrous and perhaps most unsuccessful in the history of Poland and the Polish–Lithuanian Commonwealth, he is often referred to as the "warrior king" that fought bravely to save his nation and his people.