Mesopotamia (Iraq) - Ctesiphon
Ctesiphon, situated on the eastern bank of the Tigris, was one of the great cities of ancient Mesopotamia. The ruins of Ctesiphon were the site of a major battle of World War I in November 1915. The Ottoman Empire defeated British troops attempting to capture Baghdad, and drove them back some 40 miles before trapping the British force and compelling it to surrender. Cyril Sladden referred to this battle in a letter to his father on 3rd May 1916.
Ctesiphon was the largest city in the world from 570 AD until its fall in 637 AD, during the Muslim conquest. Today, the remains of the city lie in Iraq, approximately 22 miles south of the city of Baghdad.