I Was in Trouble in the Tang Dynasty, and Your Majesty Told Me to Stand Still

Traveling back to the early Tang Dynasty, Jia Erqi used his mouth to help Li Shimin whitewash the coup during the Xuanwu Gate Incident, and obtained the bounty mansion. But he just wanted to live in peace and was unwilling to participate in the court disputes. However, due to the Turkic invasion, his father-in-law died in Jingzhou in battle. In order to comfort his daughter-in-law, he was forced to join the war and get involved in the war against the Turks. Relying on modern thinking to short-change the Turkic army's food and morale, they promoted the Weishui Alliance. Nonsensical and funny narrative style, the protagonist is not cheating, the supporting characters are well-designed, all the members are not subdued, the logic is closed loop, I have worked hard to fill in the holes dug... The protagonist is not a gentleman, and neither are the people around him...