Easton's Bible Dictionary (1897)
A cubit, the name of a hill which Joab and Abishai reached as the sun went down, when they were in pursuit of Abner (2 Sam. 2:24). It lay to the east of Gibeon.
Smith's Bible Dictionary (1863)
(head), The hill of, A hill facing Giah by the way of the wilderness of Gibeon, named as the point to which Joab pursued Abner (2 Samuel 2:24)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
AM'MAH (head, or waterfall), a hill in front of Giah, near Gibeon, to which Joab pursued Abner. 2 Sam 2:24. See also Metheg-ammah.
Hitchcock's Bible Names (1869)
my, or his, people