Historical reconstruction of the fall of Babylon to Persia has been problematic due to the inconsistencies between the various source documents. Both the Babylonian Chronicles and the Cyrus Cylinder describe Babylon being taken "without battle", whereas the Greek historians Herodotus and Xenophon[7] report that the city was besieged. The Book of Daniel implies that Babylon was taken in one night and that Belshazzar was killed.