"The greater part of their achievements," Herodotus continues, "I will omit; I will only narrate that feat which cost the most trouble and is the most worthy of notice. When Cyrus had reduced the whole of the continent he attacked the Assyrians. Now Assyria had many other large cities, but the most famous and strongest of them was Babylon, where their kings dwelt after the destruction of Nineveh. Labynetus was ruler of the Assyrians, and against him Cyrus marched." According to this more exact statement, Cyrus did not march against Babylon directly after the Lydian war, but only "when the whole of upper Asia had been reduced to subjection." That Elam and the land between the lower Tigris and the mountains of Persia was subject to Cyrus before he attacked Babylonia, follows from the statements of a prophet of the Jews.[54] Berosus says quite distinctly: "When Cyrus had subjugated the whole of Asia, he set out with a great power from Persia against Babylon in the seventeenth year of the reign of Nabonetus."[55] We can establish the correctness of this date from other sources, and prove that the war between Babylon and Persia, which Herodotus sets himself to describe in the words quoted, took place ten years after the Lydian war. Yet it remains doubtful whether Babylonia and Persia had already met in arms, before, during, or immediately after the Lydian war. So much only is certain, that if a collision of this kind had previously taken place, it was indecisive. Nor can we make it clear what motives caused Nabonetus to allow Cyrus to attack Babylonia at a time most convenient to himself; whether this attitude was due to the experience of previous failures, or to a feeling of confidence that the natural and artificial barriers of the Babylonian land offered a better prospect of success under any circumstances, than an attack on Persia.