We had no problem tearing through the first campaign ground mission for the Empire by clearing small Rebel encampments off the face of a planet with the help of stormtroopers, walkers, and Darth Vader (whose abilities let him wreak havoc on vehicle and foot soldier alike). In the ground game, you generally don't produce units by building base structures and churning them out; instead, you commission them from the galactic map after you've obtained the technology to produce them (either through research or espionage), then call in for reinforcements, which will be brought down to the battlefield by dropships. In the first mission, we tracked down small pockets of Rebel scum hiding among the trees until we reached their base, which was protected by an offsite shield generator.