A Barren Field from the Start, a Million Soldiers in the End

From the start, he possesses an ancient man’s body. He was once the young master of a landlord’s family, but his family fell into decline, and he nearly starved to death on the streets. What? Men here are being snatched up to become husbands? And foreign tribes are invading, too? ...To survive, he has no choice but to enter an estate as a lowly servant and tend a patch of wasteland. What’s there to fear? I’m a master’s graduate with top marks in physics, and I’ve studied the art of war! Foreign cavalry? Japanese pirate ships? You’re setting foot on my land! Wait, I only wanted to farm. How did this imperial robe end up on me? Looking at the million-strong army before him, he’s at a loss...