In order to get this quest you have to do all the previous quests for Lysander and also for Demosthenes and then talk again to Lysander.
Warning: You can only complete a quest for one of the sides (Spartans or Athenians). The rewards in both quests are the same. The alternative quest is The Final Battle.
Polemarch Lysander looked across the battlefield. He could taste success in the air. He only needed to seize it. It was then that he demanded Alexios fight for Sparta in the Big Battle at Megaris.
