In ancient times, people saw the eagle as a messenger from God (see 4 Ezra 11:7–8; 2 Baruch 77:19–26).
Woe! Woe! Woe: A threefold announcement would be seen as a message from God (see Acts 10:16).
The terror (Greek ouai), which sounded like an eagle's screech, was directed against those who were not among God's faithful (see Revelation 6:10; 9:4, 20).