From 1648 Timysh was a Chyhyryn centurion and together with his father took part in the campaigns of the Ukrainian army in Galicia, the Battle of Zboriv in 1649, the Battle of Berestechko in 1651, the Battle of Batih in 1652, during which he distinguished himself by courage and bravery. After the capture of the capital of the Moldavian principality by Iasi, the Ukrainian-Moldavian alliance was concluded, for the strengthening of which Tymish married the daughter of the Moldavan Prince Vasile Lupu - Ruxandra. This marriage is a very important fact, because thanks to this marriage the Khmelnytsky family was related to the most influential noble families of Eastern and Central Europe at that time - the Radziwills (Ivan Radziwill was married to Rozanda's sister), the Koniecpolski, Żółkiewski, Zbaraski and Wiśniowiecki, therefore, Bohdan Khmelnytsky in a sense became on the same social level with them.