And he came 'from the east' Isaiah 46:11! Moreover God called Cyrus 'my shepherd' and 'his anointed' (Isaiah 44:28 45:1). The Lord also spoke about 'Cyrus,' who conquered Babylon, saying, 'I will…open before him the two leaved gates and the gates shall not be shut.' Isaiah 45:1. Over 100 years earlier, God had predicted concerning Babylon and the Euphrates, 'I will dry up thy rivers.' Isaiah 44:27.

He dried up the Euphrates, just as Isaiah the prophet said he would!!! So how was Cyrus able to take the city with scarcely a fight?

However, when both the outer and inner river doors were shut and all other entrances were closed, Babylon was impregnable. This allowed cargo ships to enter Babylon and do commerce right in the city. The river Euphrates ran through Babylon, entering and exiting through two spiked gates whose bars reached down to the riverbed. The city was surrounded by massive walls considered impregnable. Ancient Babylon was situated on the river Euphrates (see Jeremiah 51:63, 64).

Euphrates river bible prophecy