Jingkang Snow: The Princess's Farewell

The blurb isn't doing this story justice, so please read the novel itself. Gender change, so don't read if you dislike that. The author has already written a million-word novel and doesn't drop stories easily. Lin Beichen is a strategy game enthusiast obsessed with the Total War series and an amateur military history buff who has studied military classics from every dynasty. Little did he know that before he could even enjoy a game, he would transmigrate into the Song Dynasty and become an imperial princess who was nearly abducted by the Jin during the Jingkang Incident. Fortunately, with his military strategies and the Mount & Blade System, he rises from a mountain of corpses, befriends Xin Qiji, joins the Yue Family Army, fights alongside Yue Fei against overwhelming odds, and leads his chariots to smash through the Helan Mountains.