'Mighty men' in the Bible

After him repaired Nehemiah the son of Azbuk, the chief of the half district of Beth-zur, even over against the sepulchres of David, and to the pool that was made, and to the house of the mighty men.

and their brethren, mighty men of valour, a hundred and twenty-eight: and their overseer was Zabdiel the son of Gedolim.