i soloed it on my titan and my warlock its not hard at all when ghost starts making the gallerhorn run out and start taking out the adds use the corridor for cover as the skiffs can 1 shot you they send around 5 waves of enemys once all the adds are dead go back towards the table and wait out the timer.. once you get the gallerhorn head to the right side where the b spawn in pvp is, there are heavy ammo boxes everywhere. just keep spamming the gallerhorn at the spider tanks the heavy ammo constantly refils once you are out of rockets as soon as both the spider tanks are dead the rest of the adds despawned and it was mission done..