Nehemiah 4:14 "And I looked, and rose up, and said unto the nobles, and to the rulers, and to the rest of the people, Be not ye afraid of them: remember the Lord, which is great and terrible, and fight for your brethren, your sons, and your daughters, your wives, and your houses."Nehemiah had it laid on his heart by God to rebuild the city of Jerusalem years after it had been destroyed by the Babylonians. At that time the Persians ruled under King Artaxerxes. It would appear that Artaxerxes and his predecessors were "godly", but their religion was one of tolerance. They were Zoroastrian; believing in good thoughts, words, deeds; one path to truth and to do the right things for the doer of good will have good returned to him. As followers of Ahura Mazda, their god was not the One True God, but the Persian kings were used by JHVH to procure the promises made to Abraham for the prosperity of his people.
With that said, Nehemiah, in tandem with the priest Ezra, rebuilt the city of Jerusalem, all the while standing vigilant over their workers so that the restoration could be completed (and it was in 52 days)!
The Hebrew people who were assigned to rebuild the city were protected by the LORD, but their role was to "fight for your brothers, your sons, your daughters. your wives and your houses". The peoples of the land resented the presence of the Hebrews back in "their city" and made every attempt to abort the completion of the restoration. (In the below picture is the artist's conception of the walls of Jerusalem destroyed by the Babylonians being viewed by Nehemiah):