Star Wars: Galactic Battlegrounds/Silken Asteroid Field

This mission is listed as a 'Challenge Mission' but is actually very easy. After an intial air attack on your base, the AI will do nothing, so don't bother building up a large army to attack them. Just sending pummels to destroy their buildings is enough.

Strategy
When the mission starts, immediately take your workers and build an anti air turret on the right side of your command center. You will use this and your inital fighters to defend from the first enemy attack.

While the turret is being constructed, some tie figters will attack your command center, followed by tie bombers. Once the turret is made, garrison your workers inside the command center to prevent them from being killed.

After their tie fighter and tie bombers are destroyed, instruct your workers to havest carbon from the rocks, and make some pummels (you will need to create a heavy weapons factory) and an air transport.

Using the air transport, ferry some pummels southwest to the enemy island. There is an anti air turret in the middle of their base so be careful not to lose your transport.

Use the pummels to destroy the enemy base while you mop up any enemy workers with your X-Wings.