Syrian-Iraqi Insurgency

Islamic State strength
Syria: Iraq:
 * ISIL: 185,000–240,000 (ISIL claim, Feb 2019)
 * ISIL: 200,000–215,000 (ISIL claim, early 2019)

In total: 430,750–509,200
 * Wilayat al-Iraq: 25,000–30,000 (ISIL claim, early 2019)
 * White Flag: 10,000–12,500 (Syria claim, early 2019)
 * Guardians of Religion Organization: 9,250–9,750 (Syria claim, early 2019)
 * Iraqi Ba'ath Party: 1,500–2,250 (Syria claim, early 2019)

Deaths (for ISIL)
Syria: Iraq: In total: ~12,517–13,195 killed, 535 captured
 * ISIL: 10,394–11,000 killed
 * Wilayat al-Iraq: 897–945 killed, 400 captured
 * White Flag: 1026–1035 killed, 100 captured
 * G.R.O.: ~200–215 killed, 35 captured