Suppose Qin Shi Huang, the first Chinese Emperor who built the Great Wall, and Hitler were alive and running fast food restaurant chains and were after your small fast food joint, I'd still ask you to relax.
True they had far better eyes and ears and spies.
True they had far better brains and advisers.
That's exactly there where the fun begins for you and me.
Qin Shi Huang knew every road and driver in his land, he knew very boat and boatman in his empire. He knew all about medicines, diseases, weather, and seasons. Still he'd go to the South China Sea and died.
Mr Hitler knew even Tibet and Myanmar. So he definitely also knew about Russia, her weather, her roads, rail lines and Russian tank production figures. Still he'd go to Russia in winter and fell.
They could not trust their own eyes and ears and spies and their own brains and advisers.There, the fun began in history and the fun begins for you and me at any point in history. They even used their hands in very similar ways, funny!