Matthew Poole and continuators on Joel 2:7

7 They shall run like mighty men , they shall climb the wall like men of war , and they shall march every one on his ways, and they shall not break their ranks ,

Locusts, and they who by the locusts are signified, viz. Chaldeans, Assyrians or Babylonians,

with speed, fierceness and irresistible power against their enemies.

Valiant and strong men, or Giants.

No walls of any fortified Towns shall be high enough to keep them out, strange locusts that assault Cities, but arm'd and commission'd of God, they shall vigorously act their part, and do what he appointeth, and commandeth them to do.

Who fear no power, that from within the Cities might oppose them, they shall valiantly and skilfully manage the assault.

Naturalists testifie the truth of this in the stories of these insects, and their marshalling of themselves, of which also, see Prov. 30.27. and Nabum 3.17. This skill in ordering, and steddiness in keeping order, like exactly trained souldiers, foretells the terrour and strength both of the Armies signified by these locusts, and of the locusts themselves. As these then did, so the Assyrians, Chaldeans or Babylonians should proceed in arms against this people.