Key Facts
- Operation dates
- May 13–26, 2015
- IS control of Syria after
- At least 50% of Syrian territory
- UNESCO designation
- World Heritage Site since 1980
- Scale
- Largest ISIL offensive in Syria since 2014 Eastern Syria offensive
- Target
- Tadmur District, Homs Governorate
Strategic Narrative Overview
ISIL launched its offensive on May 13, 2015, rapidly advancing on government positions in the Tadmur District. Over the course of nearly two weeks, Islamic State fighters overwhelmed Syrian Army defenses in the area. The offensive proved to be one of the largest ISIL had mounted in Syria, combining speed and force to seize both the modern city of Tadmur and the surrounding region. By May 26, 2015, IS had taken control of the district.
01 / The Origins
During the Syrian Civil War, the Islamic State pursued aggressive territorial expansion across eastern and central Syria. The Tadmur District, including the city of Palmyra and its ancient ruins, was held by Syrian government forces. ISIL, having already seized vast areas in the 2014 Eastern Syria offensive, sought to extend its caliphate westward into Homs Governorate, capitalizing on overstretched government defenses and the broader fragmentation of Syrian state authority.
03 / The Outcome
The fall of Palmyra to ISIL by late May 2015 marked a significant territorial gain, pushing Islamic State control to at least 50% of Syrian territory. The ancient ruins, a UNESCO World Heritage Site, came under IS occupation, raising international alarm over potential destruction of irreplaceable archaeological monuments. Syrian government forces were forced to retreat, and the loss represented one of the Syrian military's most significant setbacks of that period.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.