the use of 'de'

Hi

In lesson 5.7, there are two sentences with ‘de’: “Il déteste ordonner aux étudiants de faire leurs devoirs” and “Il nous ordonne de nettoyer la chambre”. Since faire and nettoyer are both in their infinitive form, why is ‘de’ needed in these sentences?

Thanks.

I think the verb “ordonner”, if used with the meaning “to ordering someone to do something”, ist simply used that way - ordonner … de …:

"ordonner à quelqu'un de faire quelque chose"

to order someone to do something

kind regards