Here is our Millennium Falcon Gold Medal video walkthrough for Angry Birds Star Wars Moon of Endor level 5-21. Bounce the homing egg off left side of the drum, causing it to land near the antenna on the main tower. The tower itself is rather unstable, but the AT-ST can cause massive destruction.
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Land the Homing Egg on top of the green pig with the black helmet just to the left of the antenna. The Millennium Falcon did the rest for the gold metal. A blue metal was awarded when the Homing Egg landed on the upper most peak of the house. It appears the HE has to be on the left side of the house.