When hostilities erupted in 1948, the villagers of Deir Yassin and those of the nearby Jewish village of Giv'at Shaul signed a pact, later approved at Haganah headquarters, to maintain their good relations, exchange information on movement of outsiders through village territory, and ensure the safety of vehicles from the village. The inhabitants of Deir Yassin upheld the agreement scrupulously, resisting infiltration by Arab irregulars. Though this was known to the Irgun and Lehi forces, they attacked the village on April 9, 1948. The assault was beaten off initially, with the attackers suffering 40 wounded. Only the intervention of a Palmach unit, using mortars, allowed them to occupy the village. Houses were blown up with people inside and people shot: 107 villagers, including women and children, were killed. The survivors were loaded on trucks that were driven through Jerusalem in a victory parade, with some sources describing further violence by Lehi soldiers. Four Irgun or Lehi men were killed. The incident became known as the Deir Yassin massacre.