The Dragons were boosted by the lava hounds, but dragons alone are, at times, not enough to 3-star a TH-11 base. The earthquake and lightning spell can be a game changer which can take out 2 air defenses of any level with 4 level 6 lightning spells and 2 earthquake spells, crippling a base's air defensive capability. If you are at TH-9, ask your clanmates for the 2nd earthquake spell. Ignore CC troops (most likely you can do away with them along with the air defenses with the lightning spells).
(No army intro)
Minimum Troop Housing Space Required: (not specified) Minimum Spell Housing Space Required: (not specified)