How did ancient armies actually move 100,000–200,000 soldiers across long distances without modern logistics? Like, where did they sleep, how did they get enough food and water every day, and how did they stop the whole army from just collapsing into chaos?

How did ancient armies actually move 100,000–200,000 soldiers across long distances without modern logistics? Like, where did they sleep, how did they get enough food and water every day, and how did they stop the whole army from just collapsing into chaos?