Begin the battle, only Doge, Snache and Those Guys appears to block the way of the player. When you damage the enemy's castle, the boss (Camelle) and a lot of One Horns will be spawned. A One Horn will respawn if you kill one of them.
if you don't have a Crazed Titan or Jameira but have a tanky and powerful uber (Dioramos, Sodom as example), you can get rid of all the one horns but don't send the uber, and then isolate the Camelle to get close to your base by not sending anything after killing the One Horns and then summon your uber to knock back the Camelle. Rinse and repeat by killing the One Horns with powerful AOE attackers again send your uber again. Camelle should die by then and proceed to destroy the base. (NOT recommended for 2 and 3 star difficulty)
Alternate strategy (Holy Valkyrie Freeze RNG): Attempt to build a stack of attackers (such as Paris Cat). When the Red Horns die, quickly send Holy Valkyrie. Hopefully, Holy Valkyrie will freeze Camelle and give two precious seconds to freely attack the Camelle. Holy Valkyrie at level 30 will only survive 4 hits from Camelle.Repeat this until Camelle dies.