Which novels described the plot of transmigrating to ancient times to invent firearms?

I recommend the following two novels to you: 1. "The Beginning of a County Magistrate, Eventually Becoming an Eternal Emperor's Enterprise": This was a historical fiction novel. It told the story of Tang Boyong, a modern man who transmigrated to the Dawu Dynasty. From the county magistrate to the Zhizhou, he eventually pushed for the emergence of firearms and helped the Dawu Dynasty achieve the unification of China and became a great hero. 2. "Da Ming: My Chongzhen Will Explode the World": This was a historical novel from the Song, Yuan, and Ming dynasties. It described the story of the protagonist who was reborn as Emperor Chongzhen obtaining an unlimited violent army system. With the help of the summoned generals of the past generations, he brought millions of iron pagodas, millions of tiger leopard cavalry, Hong Yi cannons, firearms, and other advanced weapons to break through the borders and dominate the world. I hope you like this fairy's recommendation. Muah ~😗