In 1672 Sultan Mehmet IV invaded at the head of a substantial army, and the Commonwealth was given a rude awakening when the seemingly impregnable fortress of Kamieniec Podolski fell to his assault. It had been defended by no more than two hundred infantry and a troop of horse, and most of its cannon had remained silent, since there were only four gunners. This level of neglect was symptomatic. There was no army with which to stem the progress of the Turkish host, and Poland could do nothing but sue for peace. The Sultan imposed the humiliating Treaty of Buczacz, which detached Kamieniec with the whole of Ukraine and Podolia from the Commonwealth, and demanded a yearly tribute. This stirred the Sejm to vote money for a new army, which provoked protest from the Porte, and another Ottoman army gathered under the Grand Vizir, Hussein Pasha of Silistria.
King Michał fell ill, and as he lay dying in Warsaw Castle, Hussein Pasha’s janissaries prepared to cross the Dniester into a Poland which faced the prospect of a new election. The King expired on 10 November 1673, and on that very same evening Hetman Jan Sobieski drew up his troops outside the Turkish camp at Chocim. On the morrow he attacked and annihilated the Ottoman army in a brilliantly executed action, news of which travelled rapidly back to the capital. The principal candidates for the throne, Charles of Lorraine, François Louis de Bourbon, Prince de Conti, and James Stuart, Duke of York (the future James II of England), were eclipsed by the aura of glory surrounding the returning hero. The szlachta assembled on the election field voted overwhelmingly for Sobieski.
Jan Sobieski, who ascended the throne as Jan III in May 1674, was an energetic man of forty-five. From his close-cropped head and his jewelled fur cap to his soft yellow boots with their silver heels he was every inch the Sarmatian magnate, and he had all the virtues and vices that implied. Since his baptism of fire at Beresteczko in 1651 he had seen service against each of Poland’s enemies in turn. Although he had commanded a 3,000-strong
At the same time he built himself an Italianate palace and collected European works of art with discrimination. He was well read in Italian and French literature, and he was one of Poland’s best letter-writers. He wrote to his French wife, Marie Casimire de la Grange d’Arquien, every day or two for twenty years, whether he was at home or on campaign, letters full of verve as well as gallantry, referring to himself as ‘Céladon’ and his wife as ‘Astrée’ or some other heroine of French literature. This Sarmatian
Jan III was a fine soldier, combining personal bravery and dash with tactical skill and a good strategic sense. He was strong and agile, quite capable of spending days in the saddle and nights under the stars, in spite of the obesity which came with age. In politics too he lacked neither enterprise nor vision. He calculated that the way to win the necessary authority to deal with internal questions lay through a successful foreign policy, and he set about constructing one.
As the political nation had never conceived a vision of its international role, the Commonwealth had no active foreign policy, only a reactive one, and no system of alliances. This had not presented a problem while it was strong and its neighbours weak, but the values in this equation had altered fundamentally.
In the south and east, the Cossacks and Tatars, who had in the past been no more than a minor nuisance, could now combine with the Turks or with Muscovy to create a formidable threat. An even greater threat loomed in the north—Sweden. This had in the past been engaged in a struggle against Danish and Dutch dominance of the Baltic and against Poland and Muscovy over its eastern shores, but it had come out of the Thirty Years’ War as a major player on the international scene.