Psalms 46:9

He maketh wars to cease unto the end of the earth - Either in all the land, or in all the world. The overthrow of the Assyrian army would probably put an end to all the wars then raging in the world. The Assyrian empire was then the most mighty on the globe; it was engaged in wide schemes of conquest; it had already overrun many of the smaller kingdoms of the world Isaiah 37:18; and it hoped to complete its conquests, and to secure the ascendancy over the entire earth, by the subjugation of India and Egypt. When the vast army of that empire, engaged in such a purpose, was overthrown, the consequence would be that the nations would be at rest, or that there would be universal peace. Compare the notes at Isaiah 14:6.

He breaketh the bow, and cutteth the spear in sunder - That is, he makes them useless, as a bow that is broken is of no value, or a spear that is cut into parts.

He burneth the chariot in the fire - The war-chariot, that which was employed in battle. See the notes at Isaiah 2:7; notes at Psalms 20:7. The expression here may refer to a custom of collecting the spoils of war into a heap, and setting them on fire. This was particularly done when the victors were unable to remove them, or so to secure them as to preclude all danger of their being taken again and used against themselves. Tiffs custom is alluded to by Virgil, AEn. viii. 561, 562,

“Qualis cram, cum primam aciem Prseneste sub ipsa

Stravi, scutorumque iucendi victor acervos.”

The idea here is, that God had wholly overthrown the foe, and had prevented all danger of his returning again for purposes of conquest.