March 30.] Upon his return to Petersburg, finding his new citadel of Cronstadt, which had been founded in the bosom of the sea, completely finished, he furnished it with the necessary artillery. But, in order to settle himself firmly in Ingria, and entirely to repair the disgrace he had suffered before Narva, he esteemed it necessary to take that city. While he was making preparations for the siege, a small fleet appeared on the lake of Peipus, to oppose his designs. The Russian half galleys went out to meet them, gave them battle, and took the whole squadron, which had on board ninety-eight pieces of cannon. After this victory, the czar lays siege to Narva both by sea and land, (April.) and, which was most extraordinary, he lays siege to the city of Derpt in Esthonia at the same time. Who would have imagined, that there was a university in Derpt? Gustavus Adolphus had founded one there, but it did not render that city more famous, Derpt being only known by these two sieges. Peter was incessantly going from the one to the other, forwarding the attacks, and directing all the operations. The Swedish general Slipenbak was in the neighbourhood of Derpt, with a body of two thousand five hundred men. The besiegers expected every instant when he would throw succours into the place; but Peter, on this occasion, had recourse to a stratagem worthy of more frequent imitation: he ordered two regiments of foot, and one of horse, to be clothed in the same uniform, and to carry the same standards and colours as the Swedes: these sham Swedes attack the trenches, (June 27.) and the Russians pretend to be put to flight; the garrison, deceived by appearances, make a sally; upon which the mock combatants join their forces and fall upon the Swedes, one half of whom were left dead upon the place, and the rest made shift to get back to the town. Slipenbak arrives soon after with succours to relieve it, but is totally defeated. At length Derpt was obliged to capitulate, (July 23.) just as the czar was preparing every thing for a general assault. At the same time Peter met with a considerable check, on the side of his new city of Petersburg; but this did not prevent him either from going on with the works of that place, or from vigorously prosecuting the siege of Narva. It has already been observed, that he sent a reinforcement of troops and money to king Augustus, when his enemies were driving him from his throne; but both these aids proved useless. The Russians having joined the Lithuanians in the interest of Augustus, were totally defeated in Courland by the Swedish general Levenhaupt: (July 31.) and had the victors directed their efforts towards Livonia, Esthonia, and Ingria, they might have destroyed the czar's new works, and baffled all the fruits of his great undertakings. Peter was every day sapping the breast-work of Sweden, while Charles seemed to neglect all resistance, for the pursuit of a less advantageous, though a more brilliant fame.