It may be inferred, I think, from the descriptions of Herodotus and Diodorus Siculus, that Babylon was built on the same general plan as Nineveh. It must not be forgotten, also, that the outer walls of Nineveh as well as those of Babylon have entirely disappeared. Are we to suppose that the historians in their descriptions confounded them with those surrounding the temples and palaces; and that these exterior fortifications were mere ramparts of mud and brushwood, such as are still raised round modern Eastern cities? Such defences, when once neglected, would soon fall to dust, and leave no traces behind. I confess that I can see no other way of accounting for the entire disappearance of these exterior walls.[197] I will now describe the results of my researches amongst the ruins near Hillah. Parties of workmen were placed at once on the two most important mounds, the Babel of the Arabs (the Mujelibé of Rich) and the Mujelibé (the Kasr of the same traveller). I was compelled, as I have stated, to abandon my plan of excavating in the Birs Nimroud. This great pile of masonry is about six miles to the south-west of Hillah. It stands on the very edge of the vast marsh, formed by the waters of the Hindiyah canal, and by the periodical floods of the Euphrates. The plain between it and the town is, in times of quiet, under cultivation, and is irrigated by a canal derived from the Euphrates near the village of Anana. Shortly after my arrival at Hillah I visited the Birs Nimroud, accompanied by Zaid, and a party of well-armed Agayls. This was unfortunately the only opportunity I had of examining these remarkable ruins during my residence in Babylonia.[198] The country became daily more disturbed, and no Arabs could be induced to pitch their tents near the mounds, or to work there.