What did Nehemiah do when he heard Jerusalem's wall was broken down?

Answer: Wept, fasted and prayed

Nehemiah sat down and wept, and mourned for days, fasting and praying before the God of heaven.

“And they told me, “The remnant who survived the exile are there in the province, in great trouble and disgrace. The wall of Jerusalem is broken down, and its gates have been burned with fire.” When I heard these words, I sat down and wept. I mourned for days, fasting and praying before the God of heaven.”— Nehemiah 1:3-4 (BSB)