Battle on Mantooine
In the year 5 BBY, amidst the armed rebellion in the Atrivis sector, the Liberators successfully captured the Imperial garrison located on Mantooine. Not long after this initial victory, the Imperial Navy launched a retaliatory strike, resulting in the Liberators' defeat. Throughout the engagement, Rebel forces employed U-wings to move their soldiers.
Sources
- Star Wars: The Rebel Files (First mentioned)