Jamieson, Fausset and Brown on Hebrews 11:34

34. Quenched the violence of fire--(Da 3:27). Not merely "quenched the fire," but "quenched the power (so the Greek) of the fire." Da 3:19-30 and 6:12-23 record the last miracles of the Old Testament. So the martyrs of the Reformation, though not escaping the fire, were delivered from its having power really or lastingly to hurt them.

escaped ... sword--So Jephthah (Jud 12:3); and so David escaped Saul's sword (1Sa 18:11; 19:10, 12); Elijah (1Ki 19:1, &c.; 2Ki 6:14).

out of weakness ... made strong--Samson (Jud 16:28; 15:19). Hezekiah (Is 37:1-38:22). Milton says of the martyrs, "They shook the powers of darkness with the irresistible power of weakness."

valiant in fight--Barak (Jud 4:14, 15). And the Maccabees, the sons of Matthias, Judas, Jonathan, and Simon, who delivered the Jews from their cruel oppressor, Antiochus of Syria.

armies--literally, "camps" referring to Jud 7:21. But the reference may be to the Maccabees having put to flight the Syrians and other foes.