1)
What is the consequence of the horses trampling on your markets?
1.
Malbim: The floor of the market will cease. This is a metaphor for how easy the conquest will be.
2)
Whom will they kill?
1.
Malbim: Everyone in the city.
3)
What are "Matzevos Uzech?
1.
Radak: They are the tall towers that stand above. They are outposts of audacity, for via them a man is brazen and elevated.
2.
Malbim: They are towers for fame and glory.
4)
Why does it say "Tered" (singular)?
1.
Radak: Each of them will descend.