There were the giants famous from the beginning, that were of so great stature, and so expert in war.
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Olympiodorus of Alexandria
This refers to demons, who in the beginning were part of the ranks of angels and were cast down from the highest heaven for their lack of respect. They are famous because their condition was foretold. They were tall in stature, though proud. “Experts in war,” since demons, or rather heretics, being unworthy of the peace of Christ, are committed to fighting him. - "Fragments on Baruch 3.26"