Jamieson, Fausset and Brown on Micah 7:12

12. In that day also--rather, an answer to the supposed question of Zion, When shall my walls be built? "The day (of thy walls being built) is the day when he (that is, many) shall come to thee from Assyria," &c. [Ludovicus De Dieu]. The Assyrians (including the Babylonians) who spoiled thee shall come.

and from the fortified cities--rather, to suit the parallelism, "from Assyria even to Egypt." (Matzor may be so translated). So Assyria and Egypt are contrasted in Is 19:23 [Maurer]. Calvin agrees with English Version, "from all fortified cities."

from the fortress even to the river--"from Egypt even to the river" Euphrates (answering in parallelism to "Assyria") [Maurer]. Compare Is 11:15, 16; 19:23-25; 27:13; Ho 11:11; Zec 10:10.