You can’t. Of course we scale up so that multiple individuals are represented on, say a scale of ten figures a man up to fifty, a hundred or even a few hundred men per figure. There aren’t that many figures, that much time or that much table space, in the world. Is there?
Of course, you knew I was setting you up to contradict myself. Yes, someone out there has made a 1 to 1 scale army, using old Airfix plastic model soldiers of Wellington’s entire army during the Peninsular War in the early 19th century. That’s two and a half DIVISIONS in a 1 figure to 1 man scale. All I can say is that he had a lot of time and a lot of skill. What he doesn’t have, as you can see, is a lot of room to maneuver this grand army of his. Unless he plays a game in a nearby airport terminal. Now, of course, he’ll have to paint a similar French force. Oy.
Imagine the YEARS that went into this effort, even with crappy paint jobs.