Atharva Veda 1.21: A prayer to Indra for protection

Lord of the clans, giver of bliss, fiend-slayer, mighty o'er the foe, May Indra, Soma-drinker, go before us, Bull, who brings us peace.

Indra, subdue our enemies, lay low the men who fight with us: Down into nether darkness send the man who shows us enmity:

Strike down the fiend, strike down the foes, break thou asunder Vritra's jaws.
O Indra, Vritra-slayer, quell the wrath of the assailing foe.

Turn thou the foeman's thought away, his dart who fain would conquer us: Grant us thy great protection; keep his deadly weapon far away.