The Sea: (Roaring) Hostile Armies
Source: TTT
Isaiah 5:30
In that day they will roar over it, like the roaring of the sea. If one looks over the land, he will see darkness and distress; even the light will be obscured by clouds.
Jeremiah 6:23
They grasp the bow and spear; they are cruel and merciless. Their voice roars like the sea, and they ride upon horses, lined up like men in formation against you, O Daughter of Zion.”