horn. Put by Figure of speech Metonymy (of Cause), App-6, for the self-protection afforded by it.
right hand. Figure of speech Anthropopatheia. App-6.
Related Commentaries of Lamentations 2:3
Lamentations 2:3
3 He hath cut off in his fierce anger all the horn of Israel: he hath drawn back his right hand from before the enemy, and he burned against Jacob like a flaming fire, which devoureth round about.