Whose flesh will be on the mountains?
Targum Yonasan: Your men who were killed. Radak ? it is not only Pharaoh, rather, him and his nation.
Why will they be on the mountains?
Radak #1: They will expect to be sheltered on the mountains; they will be killed there.
Radak #2, Malbim: Birds will carry their bodies to the mountains 1 .
They do so, lest Chayos eat them. (PF)
What is the meaning of "[u'Mileisi ha'Ge'ayos] Ramusecha"?
Rashi #1: I cast you. This is like "Ramah va'Yam" (Shemos 15:1).
Rashi #2: Ramusecha is an expression of worms, like "va'Yarum Tola'im va'Yiv'ash" (Shemos 16:20).
Radak #1: The canyons and valleys will be full of dead bodies, and Yaromu (they will be stacked high) over them, due to the great number killed. Yonason translates, the canyons will be full of the dead of your camps.
Radak #2: This is the elevation (haughtiness) of your heart. You were proud about your large army; I will fill the canyons with them.
