The victory over the Cetagandans was "peculiar".
Admiral Kanzian and Lord Regent Aral Vorkosigan both took part in the battle - Kanzian held down the defense, Aral Vorkosigan brought reinforcements.
Behind the scenes
In http://dendarii.com/bujold_faq.html#cetawars, the following authorial statement (dated to April 1995) about the Cetagandan Wars is made: "The invasion of Barrayar was the first war, and the other two wars were much less serious space-based clashes that didn't touch down on either planet."
There was at least one additional clash with Cetagandans, that described in The Vor Game.