Conquering the World, Starting with Summoning Zhou Cang

The rebel army was wiped out. Lu Chen lay among the corpses, waiting to die, when an altar sounded in his mind: Offer sacrifices to summon famous generals from history! While others draw cards based on luck, he draws from his history textbooks. Zhou Cang, Han Xin, Zhuge Liang: he knows every achievement and regret of theirs. "You have three thousand cavalry. I have five thousand years."