Rashi: It is a siege strategy to shoot catapult rocks. Radak ? the Targum of Makeh is Mechi. Kabal is the Targum of Neged; "va'Yakehu Kaval Am" (Melachim II, 15:10) is like 'Neged ha'Am.

Radak: Perhaps the Mem is extra. It shoots arrows at those who stand on the wall, so they will fear to stand there and fight.

Malbim: It is a shield Lekabel (to receive) arrows. When Yimcheh (he erases) and empties what the shield receives (arrows), he will use them to destroy your wall! They will not need war machines and catapult rocks; the arrows that the shield receives will suffice to destroy the wall.

Rashi: It is the craft of destruction that he will bring with him.

Radak: They are Kelim used to shatter rocks.

Malbim: They are swords. They will suffice to raze your towers; they will not need iron rams to batter against the wall.