The Battle of Sector 90 occurred when Captain John Sheridan decided to test the theory that telepaths could be used as weapons against the seemingly unstoppable Shadow vessels. To this end, he asked the rogue telepath Lyta Alexander to join him on a mission against the Shadows. He took the White Star into hyperspace to wait for word of a Shadow attack. A single Minbari cruiser provided escort. Moments later, a fleet of ships from the League of Non-Aligned Worlds led by G'Kar exited hyperspace. Outnumbered and faced with the power of the telepaths, the remaining three Shadow vessels fled.