13 I saw, and I heard an eagle, flying in mid heaven, saying with a loud voice, “Woe! Woe! Woe for those who dwell on the earth, because of the other voices of the trumpets of the three angels, who are yet to sound.
an eagle flying in heaven – eagles represent the end time saints, see explanation at Rev 4:7.
woe, woe, woe – the three great woes are the fifth, sixth and seventh trumpets. The fifth woe is the power to torment those who do not repent, for 150 years; the sixth woe is the Great Battle of Armageddon; and the seventh woe is the judgment of mankind.