You can earn a Gold medal easier by picking up the bombs near the force field with your tow cable
and dropping them on the bridges. This will destroy most enemies. Destroy the remaining AT-ATS by picking up the bombs and hitting the walkers in the head. This will kill them in one hit and save time. Note: You cannot drop the bombs; you have to lower your speeder so that just the bomb just touches the ground. It will then detonate.