After the Deluge: Poland-Lithuania and the Second Northern War, 1655-1660The Swedish invasion of 1655, known to Poles ever since as the 'Swedish deluge', provoked the political and military collapse of the Polish Lithuanian Commonwealth, the second largest state in Europe. Robert Frost examines the reasons for Poland's fall and the conduct of the war by the Polish government, and addresses the crucial question of why, despite widespread recognition of the shortcomings of the political system, subsequent attempts at reform