Keil & Delitzsch, on Jer 51:29

On the advance of this mighty host against Babylon, to execute the judgment determined by the Lord, the earth quakes. The mighty men of Babylon cease to offer resistance, and withdraw dispirited, like women, into inaccessible places, while the enemy sets fire to the houses, breaks the bars, and captures the city. The prophet views all this in spirit as already present, and depicts in lively colours the attack on the city and its capture. Hence the historic tenses, ותּרעשׁ, ותּחל, חדלוּ, etc. קמה is used of the permanence, i.e., of the realization of the divine counsels, as in Jer 44:23. On the singular, see Ewald, 317, a. "To make the land," etc., as in Jer 4:7; Jer 18:16, etc. "They sit (have taken up their position) in the strongholds" (Mountain fastnesses), i.e., in inaccessible places; cf. Sa1 13:16; Sa2 23:14. נשׁתה is but to be regarded as a Kal form from נשׁת; on its derivation from שׁתת, see on Isa 41:17. "They have become women;" cf. Jer 50:37. The subject of the verb הצּיעתוּ is the enemy, who set fire to the dwellings in Babylon. "Runner runs against runner," i.e., from opposite sides of the city there come messengers, who meet each other running to tell the king in his castle that the city is taken. The king is therefore (as Graf correctly remarks against Hitzig) not to be thought of as living outside of the city, for "in this case לקראת would have no meaning," but as living in the royal castle, which was situated in the middle of the city, on the Euphrates. Inasmuch as the city is taken "from the end" (מקּצה), i.e., on all sides, the messengers who bring the news to the king's fortress must meet each other.