Transmigration: The Yellow Robe Is Bestowed Upon Me

The late emperor has passed away, and the young emperor has taken the throne. But the late emperor's other sons are dissatisfied with him, and rebellions have erupted across the land. You are away fighting, commanding 600,000 infantry, 300,000 heavy cavalry, and 200,000 archers. The empress dowager orders you to return at once and protect the capital.