Great Tang: A Man from the Future in Fanyang City

I wake from a deep sleep and find that I've transmigrated back to the Tang dynasty, an age of prosperity and constant warfare. Where am I? I want to go home. Where's my phone? Why aren't there even any lights, just candles? Why am I wearing armor? Are they expecting me to go to war? A scholar like me, who can't even truss a chicken, isn't cut out for that!