Prayer to Apollo and Juno
Apollo · JunoCamillus' vow before the capture of Veii, as Livy reports it.
There are two prayers here in a single breath, and they do opposite things. Apollo is promised a tithe of the spoils — an ordinary soldier's vow. Juno is told something else: the goddess who currently lives in the besieged city is invited to change sides, to follow the victors to Rome and receive there a temple worthy of her greatness.
This is evocatio, "calling out". The Romans did not make war on foreign gods or try to overcome them — they recruited them. A city could be destroyed only after its protectress had been persuaded to leave. For the same formula set out in full, see macrobius-evocatio-001, at the siege of Carthage.
Livy writes of this four centuries later, and there is no way to test how accurate his wording is. But the rite of evocatio is independently attested, and the logic of his formula matches it.