The vizier, Baltagi Mahomet had already crossed the Danube, at the head of one hundred thousand men, and was advancing towards Jassi, along the banks of the river Pruth (formerly the Hierasus), which falls into the Danube, and which is nearly the boundary of Moldavia and Bessarabia. He then dispatched count Poniatowsky,[87] a Polish gentleman, attached to the fortunes of the king of Sweden, to desire that prince to make him a visit, and see his army. Charles, whose pride always got the better of his interest, would not consent to this proposal: he insisted that the grand vizier should make him the first visit, in his asylum near Bender. When Poniatowsky returned to the Ottoman camp, and endeavoured to excuse this refusal of his master, the vizier, turning to the khan of the Tartars, said, 'This is the very behaviour I expected from this proud pagan.' This mutual pride, which never fails of alienating the minds of those in power from each other, did no service to the king of Sweden's affairs; and indeed that prince might have easily perceived, from the beginning, that the Turks were not acting for his interest, but for their own.
While the Turkish army was passing the Danube, the czar advanced by the frontiers of Poland, and passed the Boristhenes, in order to relieve marshal Sheremeto, who was then on the banks of the Pruth, to the southward of Jassi, and in danger of being daily surrounded by an army of ten thousand Turks, and an army of Tartars. Peter, before he passed the Boristhenes, was in doubt whether he should expose his beloved Catherine to these dangers, which seemed to increase every day; but Catherine, on her side, looked upon this solicitude of the czar, for her ease and safety, as an affront offered to her love and courage; and pressed her consort so strongly on this head, that he found himself under a necessity to consent that she should pass the river with him. The army beheld her with eyes of joy and admiration, marching on horseback at the head of the troops, for she rarely made use of a carriage. After passing the Boristhenes, they had a tract of desert country to pass through, and then to cross the Bog, and afterwards the river Tiras, now called the Niester, and then another desert to traverse, before they came to the banks of the Pruth. Catherine, during this fatiguing march, animated the whole army by her cheerfulness and affability. She sent refreshments to such of the officers who were sick, and extended her care even to the meanest soldier.