Lesher was an Advozse male who served as the captain of the 53rd Armored Platoon, an armored unit in the Republic Army, during the Galactic War against the resurgent Sith Empire. In 3641 BBY, he led his platoon, along with Captain Marshall's Eighty-first Infantry, and Lieutenant Coria of the Safecrackers, in aiding Havoc Squad's assault on the Bastion to capture General Arkos Rakton, one of the Empire's greatest strategists and military leaders.