Jamieson, Fausset and Brown on Nahum 3:13

13. thy people--thy soldiers.

women--unable to fight for thee (Is 19:16; Jr 50:37; 51:30).

gates on thy land--the fortified passes or entrances to the region of Nineveh (compare Jr 15:7). Northeast of Nineveh there were hills affording a natural barrier against an invader; the guarded passes through these are probably "the gates of the land" meant.

fire shall devour thy bars--the "bars" of the fortresses at the passes into Assyria. So in Assyrian remains the Assyrians themselves are represented as setting fire to the gates of a city [Bonomi, Nineveh, pp. 194, 197].