behold. Figure of speech Asterismos.
Rabbah. Now 'Amman, on the highlands of Gilead.. large Roman city was built there four centuries later, called "Philadelphia". Its ruins yet remain.
heap. tel.
daughters: i.e. villages, or smaller dependent towns.
2 Therefore, behold, the days come, saith the LORD, that I will cause an alarm of war to be heard in Rabbah of the Ammonites; and it shall be a desolate heap, and her daughters shall be burned with fire: then shall Israel be heir unto them that were his heirs, saith the LORD.