I Have a Time-and-Space Anywhere Door, and I Travel Between Two Worlds to Save the Ming

In the thirteenth year of the Yongli reign of the Great Ming, the remnants of the dynasty are already teetering on the brink of collapse. Captain Qin Lie is trapped inside Shimen Fort, where Yunnan, Guizhou, and Sichuan meet, with fewer than a hundred battered soldiers under his command. With no money or food, they are in imminent danger. He activates a two-way portal that lets him transmigrate to the modern world, and begins exploring it. He then brings antiques, paintings and calligraphy, furniture, and other goods from the Ming dynasty back to the modern world to sell, using the money to buy rice, white flour, instant noodles, steel pipes, bicycles, walk-behind tractors, and much, much more... In the end, he builds an army of a million men and overthrows the Qing to restore the Ming!