What is "Oy l'cha Mo'av" referring to?
Rashi: It refers to Bil'am's curse of Mo'av - that they would be delivered into the hands of Sichon. 1
Targum Yonasan: It refers to those who hate the Tzadikim.
See Sifsei Chachamim.
What are the connotations of "Am K'mosh"?
Rashi and Ramban: It means the people of K'mosh, the god of Mo'av (to whom the people were totally devoted - Ramban). 1
Targum Yonasan: It means that Mo?av (who hate the words of Torah, cannot be rectified until they go into exile ?)
Ramban: See Yeshayah, 16:12 and Yirmiyah, 48:7, 35.
Who turned Mo'av's sons into refugees and its daughters captives?
Rashi: The unnamed victor (whom we know was Sichon).
Ramban: K'mosh, their god. 1
Refer to 21:29:2:2.
Ramban: K'mosh was also one of the gods of Amon, as the Pasuk specifically writes in Shoftim, 11:24.
