Leszek I the White
The decisive battle between uncle and nephew took place in 1227. Spindleshanks sent an army under the command of the voivode Dobrogost besieged Ujście, but he couldn't take the strong local fortress, and on 15 July, Odonic surprisingly attacked the voivode, who was completely defeated and killed. Thanks to this victory, Władysław Odonic was able to take control over almost all Greater Poland; however, Odonic's ally Swantopolk II unexpectedly broke the existing treaty, took Nakło and proclaimed himself Duke, ended his homage to Leszek I the White.