I think the ancients were very casual about how to solve toilet problems. That's not as particular as we are, and we don't pay that much attention to hygiene. Therefore, they should solve the problem more often nearby, and in ancient times, wars were mostly fought in the wilderness, with lush trees and more grass, so it was more convenient for them. War is always urgent and depressing, so people are very vulnerable in the face of war. In such an urgent situation, the soldiers naturally didn't take it into consideration that much. In the face of the problem of food and clothing, the problem of going to the toilet can only be regarded as a trivial matter.
Wars have occurred from time to time. War was even more inevitable in ancient times. When fighting in ancient times, we often heard that millions of troops were majestic. But were there really so many people in ancient times? As a big country with rich cultural heritage, our literature is very advanced, including countless poems and prose. For a million-strong army, it is more of an exaggerated rhetoric to describe the majestic momentum of a large number of people. It is said that there were not so many people fighting in ancient times.
In ancient times, we did not have such advanced living conditions as we do, so it is not uncivilized for soldiers to solve toilet problems nearby. On the contrary, this can be regarded as fertilizing the earth. Our ancestors were originally animals. Although we have evolved into humans now, considering that so many animals in the world have solved all the problems in life in nature, humans can naturally do the same. It's just that through evolution, we now have more rules set by ourselves and more civilization awareness.
As our technology becomes more and more developed, all our requirements for ourselves are getting higher and higher. Naturally, we cannot be like animals. But when we survive in the wild, naturally as long as we can eat and drink enough, we will not care about other issues. Therefore, the toilet problem of millions of troops is not as complicated as we think. On the contrary, it is a very simple matter.