From the Start, I Landed My Dad in Trouble by Posting the Imperial Edict, Then Smashed Huo Qubing with a Cauldron

Transmigration / History / No golden finger / Comedy / War / Political intrigue / Slow burn Built on a framework of historical fact, true to the broad strokes but flexible on the details, with answers to the lingering questions history left behind... Li Yan is a tenacious special forces soldier. He accidentally transmigrates to the reign of Emperor Wu of Han. At the Han-Xiongnu border, he marries Agula and starts a family, then later moves with them to Chang'an. Li Yan makes a living as a blacksmith, while his wife sells tofu to help make ends meet. They spend seven peaceful, uneventful years there... Then their son, Li Man, takes down the imperial notice calling for a campaign against the Xiongnu, attacks Huo Qubing, and smashes the imperial cauldron. Left with no choice, Li Yan takes his wife and son to the front lines with Huo Qubing to fight the Xiongnu. He witnesses Huo Qubing's magnificent feats: “riding over the royal court, receiving the title at Langjuxu, performing the Fengshan sacrifice at Guyan, and watering his horses in the Northern Sea.” Li Yan fears that his arrival from the future will change history. But when Huo Qubing dies, he is powerless to prevent it, and realizes that history's course is hard to alter. After returning to the imperial court, he finds its political struggles even more brutal than the battlefield, and uncovers many little-known historical truths, including the causes of death of Li Guang, Huo Qubing, and others. After going through so much, he comes to understand how insignificant an individual is before the tide of history. In the end, through perseverance and military talent, the family of three defeats the Xiongnu and pacifies the Western Regions, expands the Han Empire's borders, and guards its northwestern frontier, forging a legend of their own.