Palmyra offensive (May 2015)

The Palmyra offensive of May 2015 was a military operation launched during the Syrian Civil War by the Islamic State (IS) on May 13–26, 2015, in an attempt to capture the government-held Tadmur District of the Homs Governorate, including the administrative centre of Tadmur, known in English as Palmyra. The ruins and ancient monuments of Palmyra, which lie on the south-western fringe of the modern city, have been a UNESCO World Heritage Site since 1980.

Source: Wikipedia — Palmyra offensive (May 2015) (CC BY-SA 4.0)