Charles Ellicott Commentary Psalms 78:49

"He cast upon them the fierceness of his anger, Wrath, and indignation, and trouble, A band of angels of evil." — Psalms 78:49 (ASV)

Evil angels. —So Septuagint and Vulgate, but in the Hebrew angels (or messengers) of ills (so Symmachus), with evident reference to the destruction of the firstborn.