The procedure is performed on one’s knees before at least two witnesses, in the presence of the wrong-doer, and in the location of the offence. The criant with his hand in the air must call out —

Haro! Haro! Haro! À l’aide, mon Prince, on me fait tort.

(Hear me! Hear me! Hear me! Come to my aid, my Prince, for someone does me wrong.)

Following this, the criant must recite the Lord’s Prayer in French.

On hearing this, the alleged wrong-doer must cease his challenged activities until the matter is adjudicated in court. Failure to stop will lead to the imposition of a fine, regardless of which party is in the right. If the criant is found to have called haro without a valid reason, he in turn must pay a penalty.