In April 2016, Sargsyan led Armenia through the 2016 Nagorno-Karabakh conflict (also known as the Four-Day War or the April War), the most significant outbreak of violence on the Nagorno-Karabakh line of contact after the 1994 ceasefire and before the 2020 Nagorno-Karabakh war. The four days of fighting resulted in at least dozens of deaths and the loss of approximately 800 hectares of land. Sargsyan described the outcome of the four-day clashes as a victory for Armenia, although he faced criticism for shortcomings during the clashes as well as accusations that he had agreed to cede territory to Azerbaijan in the wake of the fighting. In order to stop this purported cession of territory, a group of armed men calling themselves "Daredevils of Sasun" seized a police headquarters in Yerevan in July 2016 and took hostages, demanding Sargsyan's resignation. The crisis, which coincided with mass protests in support of the attackers, ended with the surrender of the gunmen on 31 July 2016.