It was one of the Massacres of Poles in Volhynia and Eastern Galicia, and was perpetrated by the Ukrainian Insurgent Army (UPA).
[3] The massacre in Wiązownica was, according to activist Szczepan Siekierka, motivated by the killing of 10 ethnic Ukrainians, mainly women and children, in the village.
[4] In the morning of 17 April 1945, the UPA began their assault on the village from the San by entering from a farm.
The UPA immediately began to kill the residents of the farm, while also engaging against the emerging militia resistance.
The battle lasted five hours, saw the deaths of approximately 100 people (including 13-17 attackers), and 165 buildings were burned down, then constituting nearly half the village.