@YoMomz @UncleIroh

1000 men in rows times 1000 men in columns gives you 1 million men

( technicly my units are not right, men times men gives you square men but you know what I mean I hope )

Less than one square mile

If they have to go through a narrow pass then you can still fit most of them in one square mile outside the narrow pass waiting in turn to enter it

That gives 25 square feet or 5 feet by 5 feet per person

5000 feet by 5000 feet fits 1000 people by 1000 people