The lady who came back from the robbery turned out to be the proud female sword emperor

Reincarnated in ancient times, I was unarmed...I didn't expect to be invincible in the end.
That's right, just when I was about to use farming to develop and crush the enemy with technology, my wife appeared.
My wife is a master female sword emperor, please don't be so invincible!Otherwise, it will appear that I am holding a grenade, carrying a musket and a cannon, and I am very dumb.
Draw your sword and look around at a loss... (New book by an old author with double S, guaranteed quality)