Beth-horon means in the bible: Cave house. Beth-horon’s pass was part of the crucial road connecting Jerusalem and the sea. Lower end reaches into Ajalon valley. This area was the scene of many battles including Joshua’s defeat of Amorites with the help hailstorm Josh. 10:8-11. Also see 1 Sam. 13:18; 2 Chr. 25:13.
(in Bible Dictionary)