What is "Kidon"?
Metzudas Tziyon: It is like a spear, like "Natah ba'Kidon" (Yehoshua 8:26).
What is the meaning of "Yachaziku"?
Rashi: They will take. This is like "va'Yishlach Yado va'Yachazek Bo" (Shemos 4:4).
Radak: He will hold.
Do the same people hold bows and spears?
Radak: Yes. Everyone holds two weapons.
What is the sea's clamor?
Radak: It is the clamor of the waves.
What is the significance of the noise?
Malbim: They make noise to scare their opponent.
Will all ride on horses?
Radak: No - there will also be many on horses. They fight more strongly.
What is the meaning of "Aruch ka'Ish la'Milchamah"?
Radak: Each is armed with weapons, like one who is designated to fight an arranged war with his colleague. He prepares himself with weapons. Usually, a large army is not armed so much. Here, each will be armed as if he alone is fighting.
Malbim: This refers to the horses; they are trained for war like men.
Why does it say "Alayich Bas Tziyon"?
Malbim: They are not coming by chance, rather, specifically for you.