Isaiah 5:29

“Their roaring [shall be] like a lion, &c.] When engaged in war, just seizing on their prey. The phrase denotes their fierceness and cruelty, and the horror they should inject into the hearts of their enemies: they shall roar like young lions; that are hungry, and almost famished, and in sight of their prey; (see <180410>Job 4:10): yea, they shall roar, and lay hold of the prey; seize it with great noise and greediness: and shall carry [it] away safe; into their own den, the country from whence they come: and none shall deliver [it]; this shows that respect is had; not to the Babylonish captivity, from whence there was a deliverance in a few years; but the Roman captivity, from thence there…”

“roaring--their battle cry.”

“Their roaring ... - Their battle cry, or their shout as they enter into an engagement. Such a “shout,” or cry, was common at the commencement of a battle. War was very much a personal conflict; and they expected to accomplish much by making it as frightful and terrible as possible. A shout served not only to excite their own spirits, but to produce an impression of their numbers and courage, and to send dismay into the opposite ranks. Such “shouts” are almost always mentioned by Homer, and by other writers, in their accounts of battles. They are often mentioned, also, in the Old Testament; Exodus 32:18; Joshua 6:10, Joshua 6:16, Joshua 6:20; Jeremiah 50:15; 1 Samuel 17:20, 1Sa 17:52; 2…”

“Roar - Which signifies both their cruelty, and their eagerness to devour the prey. Isaiah 5:30”

“roaring: Isa 31:4; Gen 49:9; Num 24:9; Jer 4:7, Jer 49:19, Jer 50:17; Hos 11:10; Amo 3:8; Zac 11:3 lay hold: Isa 42:22, Isa 49:24, Isa 49:25; Psa 50:22; Mic 5:8 Isaiah 5:30”

“"Roaring issues from it as from the lioness: it roars like lions, and utters a low murmur; seizes the prey, carries it off, and no one rescues." The futures, with the preceding לו שׁאגה which is equivalent to a future, hold each feature in the description fast, as if for prolonged contemplation. The lion roars when eager for prey; and such is now the war-cry of the bloodthirsty enemy, which the prophet compares to the roaring of a lion or of young lions (Cephirim) in the fulness of their strength. (The lion is described by its poetic name, לביא; this does not exactly apply to the lioness, which would rather be designated by the term לביּה.) The roar is succeeded by a low growl (nâham,…”