Rev 9:1-21. The fifth trumpet: The fallen star opens the abyss whence issue locusts. The sixth trumpet. Four angels at the Euphrates loosed.
The last three trumpets of the seven are called, from Rev 8:13, the woe-trumpets.
fall - rather as Greek, “fallen.” When John saw it, it was not in the act of falling, but had fallen already. This is a connecting link of this fifth trumpet with Rev 12:8, Rev 12:9, Rev 12:12, “Woe to the inhabiters of the earth, for the devil is come down,” etc. Compare Isa 14:12, “How art thou fallen from heaven, Lucifer, son of the morning!”
the bottomless pit - Greek, “the pit of the abyss”; the orifice of the hell where Satan and his demons dwell.