Muslim powers became increasingly concerned about the rapid rise of a Christian state in southern Caucasia. In 1121, Sultan Mahmud b. Muhammad (1118–1131) declared a holy war on Georgia and rallied a large coalition of Muslim states led by the Artuqid Ilghazi and Toğrul b. Muhammad. The size of the Muslim army is still a matter of debate with numbers ranging from a fantastic 600,000 men (Walter the Chancellor’s Bella Antiochena, Matthew of Edessa) to 400,000 (Smbat Sparapet’s Chronicle) to modern Georgian estimates of 250,000–400,000 men. All sources agree that the Muslim powers gathered an army that was much larger than the Georgian force of 56,000 men. However, on 12 August 1121, King David routed the enemy army on the field of Didgori, achieving what is often considered the greatest military success in Georgian history. The victory at Didgori signaled the emergence of Georgia as a great military power and shifted the regional balance in favor of Georgian cultural and political supremacy.