Release the rest of your Giants near the opening. Use a Healer, if possible.
If needed, use a few Barbarians for support.
Now line up your Archers near any exterior buildings. Never put them all in one spot. Then use your Wizards for a decent damage boost.
Now for the air assault. Use 2 Balloons on each Archer tower. If a Wizard Tower is present, use 4 Balloons on it. Alternatively, you could use a Dragon if you have one available in your Clan Castle or Army Camps.
Don't worry about Cannons or Mortars, the Balloons will eventually destroy them.
Once the Defenses are neutered, send your Goblins for clean-up.
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This is actually an expensive attack to use for lower level players, but it usually gives me 2-3 stars.