The Second Cetagandan War was a war that occurred between Barrayar and Cetaganda, probably during Ezar's reign. It is not directly attested in text; instead, the Cetagandan Invasion is described as the First Cetagandan War, and there is mention of a Third Cetagandan War near the beginning of Aral Vorkosigan's Regency. It was probably a space-based war concerning control of wormholes, but nothing certain can be stated.