A.T. Robertson Commentary Revelation 16:19

"And the great city was divided into three parts, and the cities of the nations fell: and Babylon the great was remembered in the sight of God, to give unto her the cup of the wine of the fierceness of his wrath." — Revelation 16:19 (ASV)

Was divided into three parts (εγενετο εις τρια μερη). "Came into three parts" (γινομα again). In 11:3 a tenth part of the city fell. Babylon (Rome) is meant (17:18).

Fell (επεσαν). Second aorist active indicative of πιπτω (-αν form in place of -ον).

Was remembered (εμνησθη). First aorist (prophetic) passive indicative of μιμνησκω. Babylon (Rome) had not been overlooked. God was simply biding his time with Rome.

To give unto her (δουνα αυτη). Second aorist active infinitive of διδωμ, epexegetic use as in 11:18; 16:9.

The cup of the wine of the fierceness of his wrath (το ποτηριον του οινου του θυμου της οργης αυτου). "The cup of the wine of the wrath of his anger," using both θυμος (boiling rage) and οργη (settled anger). See both in Jer 30:24.