The Fall of Rome: Rebuilding the Empire from Britain

(The rating just came out, it might go up, that's what everyone's saying.) [No system + King Arthur + Industrialism + Farming + Warfare + Western Europe/Medieval/Roman + Decisive ruthlessness] In 410 AD, Emperor Honorius of the Western Roman Empire issued a letter to the British city-states, stating, "From this day forward, defend yourselves." The British provinces were abandoned by the Empire! In the north, the Picts' battleaxes are already thirsting for blood; In the East, Anglo-Saxon longships are about to invade. The centuries-long massacres in ancient British history, the Heptarchy, the cultural discontinuity... Is chaos about to begin?! Horn, who had traveled from another time, was a Roman centurion left behind in Britain. He sneered, "They're just Germanic barbarians. Slaughter them all!" "Gentlemen, I am Rome!" He wanted to use the corpses to light the first blast furnace and use the church's silverware to cast the first silver coin. Salt, steel, refractory bricks, cement, hydraulic forging hammers... treasures from the past are transformed into the most primitive industrial life in his hands! Macedonian phalanxes, heavily armored Roman infantry, armored cavalry, crossbowmen... his standing army will set all of Rome ablaze! Since Rome has abandoned this place. Now that all the kings have left the stage. Then, amidst mountains of corpses and seas of blood, he was crowned King Arthur!