Quickly place all Wall Breakers in the same spot right next to the giant
Place the rest of the giants in the same spot
Place all Barbarians near Giants
Place all Archers in a row near the wall you placed the giants
Wait until most defenses are taken out
Place as many goblins as you want to clean up the resource buildings
(No execution notes)
I use this as a Town Hall 3 strategy. It works every time i've attacked so far. If you do it right, you should 3 star any base at around the same level as you. Note: Goblins are optional. If you don't want to use them, use more Archers and Barbarians. Try to keep the same amount of archers you have as the same number of barbarians you have.