Once Alexander reconquered [[Greece]], he decided to put into action his father’s plan of conquering Persia, led by the Persian king [[Darius]]. He formed an army of thirty thousand foot soldiers, five thousand cavalry men, and engineers to build siege engines. | Once Alexander reconquered [[Greece]], he decided to put into action his father’s plan of conquering Persia, led by the Persian king [[Darius]]. He formed an army of thirty thousand foot soldiers, five thousand cavalry men, and engineers to build siege engines. |