June 24, 2015 - Institute for the Study of WarISIS lost control of its primary Libyan stronghold in the eastern city of Derna on June 12. Local Islamist groups expelled ISIS from the city following ISIS’s assassination of a local leader. The loss of Derna is unlikely to affect ISIS’s military strategy in Libya, as the organization controls other cities along the central coast. However, it suggests that ISIS may struggle to maintain social control in cities outside of Iraq and Syria, as the organization ultimately seeks to do across the Middle East and North Africa.