Sirko's campaigns were a series of raids and military actions carried out by Cossack leader Ivan Sirko during his fight against Crimean Khanate, Nogai Horde and Ottoman Empire, in 1654–1679.
Ivan Sirko's campaigns played a crucial role in weakening the Crimean Khanate, forcing the Tatars to retreat from areas of the Pontic–Caspian steppe and paved a way for settlers from Ukraine, which contributed to civilization of the Wild Fields.
The Cossack raids largely developed as a reaction to the Crimean–Nogai slave raids in Eastern Europe, which began in 1441 and lasted until 1774. From c. 1492 onwards, the Cossacks (the Zaporozhian Cossacks of southern Ukraine and the Don Cossacks of southern Russia) conducted regular military offensives into the lands of the Crimean Khanate, the Nogai Horde, and the Ottoman Empire, where they would free enslaved Christians and return home with a significant amount of plunder and Muslim slaves. Unlike the Tatars, Cossack raiders were capable of capturing and devastating highly fortified cities. Though difficult to calculate, the level of devastation caused by the Cossack raids is roughly estimated to have been on par with that of the Crimean–Nogai slave raids. According to History of Ruthenians, Cossack raids during Sirko's era were a hundred times more devastating than Crimean–Nogai raids.