The PSP played an important role in the so-called Mountain War under the lead of Walid Jumblatt: after the Israel Defense Forces (IDF) retreated from the Chouf District, important battles took place there between the PSP/PLA and the Lebanese Forces militia. Both the Lebanese Forces and the PSP/PLA were accused of committing massacres and atrocities against one another as tit-for-tat (revenge killings). This was a sad hallmark of the Lebanese Civil War because the innocent people were the ones who paid the highest price.