By everyone else's ships. Master Chief's, actually. He never sent all his ships through. Only 500 of his robots. And he had accest to a lot of ships, more capable than enough to make a star go supernova.
Oh, but we did. We said that "joining the Hierarchy would grant access to the full extent of the fleets so that he could use them at his will." In our group chat, everyone agreed to destroy the sun. The imtent was the same. That's means, motive, and opportunity.