Which preposition to use with iras

at Occurrences 2%

*The oration consisted of several parts, each ending with a kind of burden of "Citoyens, la patri est en danger;" and the arrangers of the ceremony had not selected appropriate music: so that the band, who had been accustomed to play nothing else on public occasions, struck up ca ira at every declaration that the country was in danger!

Which preposition to use with  iras