What does Nehemiah 12:40 mean?

By the spring gate, and straight before them, they went up by the stairs of David’s city, at the ascent of the wall, above David’s house, even to the water gate eastward.

The other company of those who gave thanks went to meet them, and I after them, with the half of the people, on the wall, above the tower of the furnaces, even to the wide wall,

and above the gate of Ephraim, and by the old gate, and by the fish gate, and the tower of Hananel, and the tower of Hammeah, even to the sheep gate: and they stood still in the gate of the guard.

and the priests, Eliakim, Maaseiah, Miniamin, Micaiah, Elioenai, Zechariah, and Hananiah, with trumpets;

and Maaseiah, Shemaiah, Eleazar, Uzzi, Jehohanan, Malchijah, Elam, and Ezer. The singers sang loud, with Jezrahiah their overseer.

They offered great sacrifices that day, and rejoiced; for God had made them rejoice with great joy; and the women and the children also rejoiced; so that the joy of Jerusalem was heard even far away.