'Fortress' in the Bible

The words of Nehemiah son of Hacaliah:During the month of Chislev in the twentieth year, when I was in the fortress city of Susa,

And let me have a letter written to Asaph, keeper of the king’s forest, so that he will give me timber to rebuild the gates of the temple’s fortress, the city wall, and the home where I will live.” The king granted my requests, for I was graciously strengthened by my God.

Then I put my brother Hanani in charge of Jerusalem, along with Hananiah, commander of the fortress, because he was a faithful man who feared God more than most.