War of Resistance: Start on an Island and Make Your Own Weapons

You start on an island and make all the equipment yourself. Own an ever-expanding island. There is food, livestock, and arsenals on the island. No weapons? Make it yourself. Poor weapons? Is the Type 38 rifle good or bad? Then the M1 Garand semi-automatic rifle. If the Type 92 infantry gun is not good, then make the M1 howitzer. Yamato battleship? Just like no one can build battleships or aircraft carriers. Are the battleship Montana and the Essex class aircraft carrier enough? Do you want the whole country to be shattered? No need, there are millions of troops waiting for you. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.