It could quickly move men and supplies for the war around :)
The answer is true your welcome
The Babylonian Exile was the forced detention of Jews in Babylonia after the conquest of the kingdom of Judah in 598 and 587 BCE.
The exile ended after 70 years when the Persian conqueror Cyrus the Great gave permission to the Jews to return to Palestine
Some of them did not return it ha been 70 years since the destruction of Jerusalem, many were unable to endure the journey of approximately 900 miles, other were born during the exile and that was their city. Also, many Jews attained a significant status during the reign of Cyrus and were comfortable there.
