Peter the Great had succeeded in gaining a toehold in the south, on the edge of the Black Sea, in the Azov campaigns. Catherine completed the conquest of the south, making Russia the dominant power in south-eastern Europe after the Russo-Turkish War of 1768–1774. Russia inflicted some of the heaviest defeats ever suffered by the Ottoman Empire, including the Battle of Chesma (5–7 July 1770) and the Battle of Kagul (21 July 1770). In 1769, a last major Crimean–Nogai slave raid, which ravaged the Russian held territories in Ukraine, saw the capture of up to 20,000 slaves.