How did Mulan, as a woman, lurk in the military camp for twelve years without being discovered?

It was written in the Biography of Mulan that after years of war, Mulan returned to her hometown and the emperor wanted to reward her.

Since he can get a reward from the emperor, he must be no ordinary soldier or pawn. Mulan should be a rank official, just like a general.

When you become an official, ostentation and extravagance will naturally come up. At night, even if she is marching outside to fight, she is qualified to have a tent by herself. When she goes out during the day, she will wear men's clothes and act like a man. It is difficult to see the gender problem.

Moreover, marching and fighting must be divided into pains, and every day is very hard. Who still has time to do nothing, study whether the people around him are men or women. Besides, it was in ancient feudal times, and it was hard for them to think that a girl would be so bold to join the army instead of her father.

Even if someone can see that Mulan is a woman, he dare not say so. Maybe Mulan is his boss. How dare he question his boss? Even if it's not his boss. If a woman can stay in the military camp of Nuoda, she will think that this is a little beauty, and then she will see through it.