Being Demoted to the Wilderness, I Lit up the Technology Tree at the Beginning

"Clan leader! We are defeated!" "Defeat? How could 20,000 cavalry be defeated by the prince of the Southern Dynasty who only cares about pleasure and his thousands of hungry people?" "The leader... His city wall... Can breathe fire! It's a kind of magic called 'artillery'. Once the cannon comes, the mountains will flatten! Our warriors haven't even rushed to the city, but... They're gone!" "Sorcery?" "General! His soldiers... Are even more terrifying! The fire sticks in their hands can penetrate our thickest armor! Killing someone from a hundred steps away is more ruthless than the most poisonous scorpion on the grassland! We... We can't get close to them at all!" "How could this happen?!" "The leader... The spy we sent to spy reported... The prince is currently sitting on a steel monster (train) without a horse, drinking ice wine and watching a show... He said... He said we are welcome to go and give away people's heads again..." They say Chu Yuan is a weak loser, but who loser can arm an army with steel? They say Shazhou is a barren land, but who can produce 10,000 kilograms of steel a day in a barren land? We thought we were hunting a fat sheep, but instead we stumbled into the gods' slaughterhouse! How can we fight this battle?