Alliance with the empire.The immediate result of this discovery was the conclusion of an alliance, offensive and defensive, with Austria (March 31st). Leopold bound himself to bring 60,000 men into the field; the republic was to furnish 40,000. There was an express stipulation that neither party should apply to the Pope for leave to break his oaths. The Papal Nuncio procured the addition of a clause, by which John bound himself to command his troops in person.[79] Leopold in return conceded to him that title of “Majesty” which he had so long withheld.

Exertions of Sobieski.This treaty was a serious blow to the policy of Louis XIV. Forbin-Janson, who soon quitted Poland in disgust, comforted his master by the assurance that John was far too unwieldy to take the field. The same idea prevailed throughout Europe, and especially in the Turkish camp. He was now so stout that he required aid to mount his horse; but he had not lost one spark of his youthful fire. His army needed complete reorganisation, and he spent several hours each day in the field. He did not neglect measures of policy. He proposed to the Emperor the extension of the league, and confided to him his favourite scheme of reviving a republic in Greece. By that means alone, he thought, the Turkish empire could be confined within bounds. He sent an embassy to the Sophy of Persia, but could not persuade him to declare war against the Porte.[80] He then tried to mediate between the Emperor and the insurgents in Hungary, and succeeded so far as to obtain a promise from Tekeli that Moravia should be left untouched.[81] Finally he tried to promote a good understanding between France and Austria, but Louis sullenly refused his mediation.

The Vizier’s forces.The preparations of the Grand Vizier were now complete, and in the spring he advanced his vast host to Essek, in Hungary. He had under his standards at least 300,000 combatants[82] and 300 pieces of artillery. He was accompanied by Selim Gieray, the terrible Tartar khan, and by a crowd of his nomad horsemen.

Rapid advance of the Turks upon Vienna.The Emperor could scarcely realize the peril in which he stood. He reckoned that his frontier fortresses would detain the Turks for at least two campaigns. Fortunately Sobieski, by means of a letter which his Cossack spies intercepted[83] in Bulgaria, was enabled to assure him that Vienna would be the first point of attack. This intelligence was soon put beyond a doubt. The Duke of Lorraine, general of the Imperial forces, who with scarcely 30,000 men was covering Upper Hungary, was compelled to retreat. The whole Turkish army continued to advance by forced marches, leaving the fortresses in their rear; and Lorraine had barely time to throw 8,000 infantry into Vienna and retreat beyond the Danube, before 50,000 Tartars, the advanced guard of Mustapha, appeared at the gates (July 9). Leopold had profited by Sobieski’s warning to demolish the extensive suburbs where the nobility resided, but the city was wholly unprepared for defence.

Panic at Vienna.The night before Lorraine’s arrival the Emperor himself with his court fled precipitately to Linz, and thence to Passau. The peasants of the southern plain were flocking into the city by hundreds, while many of the citizens followed the Emperor in his flight. Measures for defence.It was left to Lorraine, with the governor, the intrepid Count Stahremberg, to concert measures of resistance. The fortifications were hastily repaired, and the counterscarp protected by thick palisades, but it was doubtful whether they could stand an assault, owing to the neglect of a long security. A body of 5,000 citizens was formed to assist the garrison, which did not amount to 14,000 men. A week later (July 14) the Grand Vizier occupied the plain, and opened the trenches before the city.

Terror of Europe.Meanwhile all Europe, and especially Italy, was seized with consternation at the rapid march of the Turks. The plans of the King of France, who had advanced his army to the Rhine, were somewhat disconcerted. Finding himself pointed at as the cause of the invasion of Christendom,[84] he made a show of magnanimity, and suspended his threatened blow. It is even said that he offered the Emperor a contingent of 80,000 men, which was rejected with becoming scorn; but the statement seems improbable.

Sobieski urged to hasten his march.The Pope sent pressing messages to Sobieski to bring his succours before it was too late. The Emperor also, writing with unwonted deference, begged him to place himself at the head of the Imperial troops. “However inferior we are in number,” he says, “your name alone, so terrible to the enemy, will ensure a victory.” He added that his troops were waiting at Tuln, fifteen miles north-west of Vienna, and that at that point a bridge had been constructed over the Danube.[85] Lorraine, generously forgetting their old rivalry for the crown of Poland, wrote that he should be proud to serve under such an hero. His own skill had given some hope to a declining cause. Assisted by some Polish cavalry, he had captured the bridge of Presburg from Tekeli, but his force was too small to do any damage to the besiegers.

Siege of Vienna.It is indeed a marvel that Vienna did not fall almost at once. Within a week of the opening of the trenches, the besiegers had reached the palisade of the counterscarp, and, as cannon could not be used for its defence, many of the garrison lost their lives in a hand-to-hand combat. On the 7th of August the counterscarp was captured after an engagement in which both sides suffered great loss. The besieged especially lost many officers, and the brave governor was seriously wounded. From this time forward the city must have succumbed if the Vizier had ordered a general assault. Mustapha knew this, but he imagined that the booty would be enormous, and he did not wish it to fall into the hands of his soldiers. He had pitched his vast pavilion in the gardens of the Emperor’s palace, called the Favourite, and here he passed his days in the pursuit of pleasure. His miners advanced steadily, but in other respects he was inactive.

Measures of Sobieski.At the first news of the danger of Vienna Sobieski hastened to Cracow, where his army was assembling. His hussars answered his summons with alacrity, but the Lithuanians were slow to take the field. He had no intention of waiting for them, although the troops under his orders were scarcely half the complement of 40,000. He sorely needed funds for their equipment; but as the Papal subsidies had not arrived,[86] he gave lavishly from his private treasury. He had not intended to take his Turkish body-guard; but they begged leave to accompany him, and offered to give hostages.[87]

His rapid march to the Danube.On the 15th of August he quitted Cracow, accompanied by his son James, and having reviewed his troops at Tarnowitz, in Silesia (August 18), pushed on for the Danube. Leaving his main body at the head of 2,000 horse, he traversed like a whirlwind the plains of Moravia, and arrived at Tuln on the 2nd of September. The prince who was reported too infirm to take the field, had covered on horseback 350 miles in little more than ten days. Finding the bridge unfinished and scarcely half the Imperial forces assembled, he could not restrain his impatience. “Does the Emperor take me for an adventurer?” he exclaimed angrily. “I have left my army to command his. It is not for myself, but for him I fight.” Three days later (September 5th) the Polish army under Jablonowski appeared, and soon afterwards the succours from Bavaria and Saxony.