Kingdom's and Armies

Summon into a different world. Declared as a hero to rescue the fate of the world from destruction. The hero finally defeats a violent, powerful enemy. Who dare to endanger the world. A boy who did his best to overcome any situation. To bring Safety and Peace for everyone. Now, finally returning back to give the news to a Ruler of the kingdom. Expecting a handsome reward. And to be with the girl that he deeply loves. But things turn unexpectedly and for the worse. When the ruler of the Kingdom and his friends and the girl he loves betray him. Declared as a threat to society. After the betrayal and being eliminated by the Rulers Knights. He wakes up in an unknown and a different fantasy world. And notice that he isn't a hero anymore. But a General now. That is, able to Spawn an Army and build a powerful military according to his rank. The more he levels up. The more soldiers increases. And the more he ranks up. He unlocks more soldiers from a different Era. From his own world. How would he use his new founded abilities for? For Good or for bad?