2 carriers (IIRC) were destroyed at Luna. We dont' know if any carriers were mothballed at the Trojan IV shipyards or any other of the major shipyards in the core worlds.
Three carriers were destroyed in drydocks on the moon.
Was it a condition in the truce that so much of the fleet had to be completely shut down? Doesn't make sense to me - a more prudent course of action would have been to maintain the fleet on stand-by, just in case hostilities resumed - which, of course, they did. Or was it for economic and social reasons (weary troops)?
I realise this probably has been discussed before, but the absurdity of the Confederation fleet dismantling really struck me just now.
The armistice deal required that both fleets immediately cut their active fleets by 50% (the Confederation ultimately cut the active fleet to 48% of the pre-armistice level). The ships were only mothballed and not scrapped - the novel mentions that the Kilrathi (and Jamison) demanded the latter and even threatened to withdraw from the negotiations over the issue, but that the civilian government refused. Which is to say that the fleet was not dismantled - it was put into storage, ready to be reactivated when the need arose.
The biggest problem doesn't seem to have been the cases where the ships were simply put into storage -- recall that Tarawa was mothballed and then reactivated very quickly -- but rather the cases where the Confederation was hoping to take advantage of a longer peace to repair war-weary ships (an increasing necessity on both sides). The carriers that were unable to take part in the battle (and the two that were delayed) weren't able to get underway because their reactors had been pulled as part of a major refit, overhaul and re-alignment of their jump engines.
The economy was in trouble, too (plunging into a depression), which exacerbated the situation and forced the government to make a lot of decisions that would ultimately make it harder to get back on a war footing. The armistice brought with it a freeze on new defense contracts and on all ship production. The immdiate military effect was that ships which should have entered service to replace ordinary losses (a carrier, several cruisers, others) did not do so. Others were delayed and still others did not begin construction as planned. Idled shipyard workers left their war jobs to find work in the private sector. This not only further delayed the ability to restart war production, but it also created a huge spike in unemployment - since a lack of new contracts meant less need for workers. Even worse, war workers who were previously unable to strike (during wartime) suddenly could - and did. Those same economic pressures, plus political necessities (constituencies demanding of their Senators that their boys be discharged), prompted massive discharges of military personnel. Hundreds of thousands of soldiers, sailors and spacemen came home immediately, with more to follow. There weren't jobs for them, either. The government attempted to curve some of those money issues by cutting corners with the active military - flight training time for fighter pilots was cut in half and the main battle fleet of heavy cruisers, kept in active service, was not put to space (with crews allowed to go on leave).