2. If an insult follows an unpolite expression,--if the aggressor considers himself offended, or if the person who has received the insult, considers himself insulted,--the case must also be referred to a meeting. 3. If in the course of a discussion, during which the rules of politeness have not been transgressed, but in consequence of which, expressions have been made use of, which induce one of the party to consider himself offended, the man who demands satisfaction cannot be considered the aggressor, or the person who gives it the offender. This case must also be submitted to the trial of chance. 4. But if a man sends a message, without a sufficient cause, in this case he becomes the aggressor; and the seconds, before they allow a meeting to take place, must insist upon a sufficient reason being manifestly shown. 5. A son may espouse the cause of his father, if he is too aged to resent an insult, or if the age of the aggressor is of great disparity; but a son cannot espouse the quarrel of his father if he has been the aggressor.[21] 6. There are offences of such a galling nature, that they may lead the insulted party to have recourse to acts of violence. Such acts ought invariably to be avoided, as they can only tend to a mortal combat. 7. The offended party has the choice of arms.[22] 8. When the offence has been of a degrading nature, the offended has the right to name both arms and duel.[23] 9. When the offence has been attended by acts of violence, the offended party has the right to name his duel, his arms, the distance, and may insist upon the aggressor not using his own arms, to which he may have become accustomed by practice; but in this case, the offended party must also use weapons in which he is not practised. 10. There are only three legal arms: 1st, the sword; 2nd, the sabre; 3rd, the pistol. The sabre may be refused even by the aggressor, especially if he is a retired officer; but it may be always objected to by a civilian. 11. When a challenge is sent, or a meeting demanded, the parties have a mutual right to the name and address of each other. 12. The parties should immediately after seek their seconds, sending to each other the names and addresses of their seconds.[24]