One of Koniecpolski's greatest victories occurred during a winter 1644 campaign against Tatars. With a large army of some 19,000 soldiers (60% of them, magnates' private armies; Koniecpolski's own forces numbered 2,200) he dealt a crushing defeat to Toğay bey's forces near Ochmatów on 30 January 1644. Many Tatars drowned near Sina Woda when the ice over the water gave way. The Battle of Ochmatów, the Commonwealth's greatest victory over the Tatars in the first half of the 17th century, brought international fame to Koniecpolski, who had not only predicted the time and place of their attack but had destroyed their forces before they could deploy their usual tactic of splitting their main forces into multiple highly-mobile units ("czambuls").