Everyone here stopped playing this game years ago, but since I picked it up used and started playing a couple of months back...
One mission on the Rebel Campaign, not understanding the mission (thought you had blow the bunker up, not just stop and then go), having Chewbacca steal a hover tank and drive it around in circles being pursued by AT-ST's and stormtroopers. It took many tries to complete that mission.
Imperials invade Endor, I had NO troops there. No barracks. The Ewoks alone destroyed the entire Imperial invasion force...without the aide of a single defense turret. Second invasion attempt, I had some infantry, the Ewoks managed to destroy an AT-AT before my plex troopers even showed up.
After taking out an AT-AT, Han Solo was the only survivor of my Corellian raiding force, even Chewie bought it. But thanks to his fellow Corellians and defense turrets, Han liberated the whole planet, taking out two light vehicle factories, lots of AT-ST's, fighter tanks and stormtroopers.
Jabiim...as the Empire, I lost most of my units to rebel invaders, but destroyed all theirs except C-3PO and R2-D2, who were hiding with the local resistors. I had barracks, but getting a few squads to take out all the resistance dwellings and find the droids took a long time. Kept losing squads, then having to send out a fresh one.
One conquest, Ackbar kept attacking the Death Star and then he'd retreat after a minute, losing gobs of A-Wings.