The Battle Hostile_encounter of Kostiuchnówka was a World War Military_operation I battle that took place Process_start July 4–6 , 1916 , near the village of Kostiuchnówka ( Kostyukhnivka ) and the Styr River in the Volhynia region of modern Ukraine , then part of the Russian Empire .

After losing Earnings_and_losses a battle Hostile_encounter near Winnica , Poles had to retreat Escaping back to Volhynia .