Mine is when I attacked the Rebel fleet that had recently seized Coreilla. I had 3 ISDs, 3 Tartans, and Piett's ISD against 4 Mon Cal Cruises, the Home One, and multiple corvettes. The corvettes were destroyed at the outset as they always are, and I then encountered the Mon Cals. Piett's ISD was overcome by the Home One and 2 Mon Cals, but my fighters and bombers continued swarming them. Towards the end, it was two heavily damaged Mon Cals verses a somewhat damaged ISD, but I managed to win it because most of the TIEs from the previous ISDs were still around. It was brutal, but I won with a heavily damaged ISD and 8 TIE squadrons. ;D