Koboissen! Hado-ho no Kagayaki

A large fleet of Gatlantis warships have warped out over Brumis. They begin taking a large cone shape above the planet. The Yamato, trapped underground, devises a plan of escape. Analyzer, the Yamato's Autonomous Unit, along with Shiro Sanada discern that the cone shaped fleet is a large gun, aimed at Earth. With no other choice, the Yamato launches, and against the promise of Juzo Okita, fires the wave motion gun, disabling the fleet.