Chapter — Slater, Manual of Moral Theology
Chapter V. Duelling
A DUEL is defined to be a premeditated and prearranged combat between two persons with deadly weapons, and usually in the presence of at least two witnesses, called seconds, for the purpose of deciding a quarrel, avenging an insult, or clearing the honour of one of the combatants or of some third party whose cause he champions.
A duel, then, is a premeditated and prearranged single combat, for if two persons begin to quarrel and then come to blows, it is not a duel even if death be the result. Nor is it a duel if two enemies meet by accident and begin straightway to fight. A duel is a combat with deadly weapons, so that a fight with sticks or with the fists is not a duel. Although seconds are commonly present, yet their absence would not prevent a single combat from being a duel if the other conditions were verified. The duel is for the purpose of deciding a private quarrel, and for such a purpose it is unlawful even if it have the sanction of public authority, for there are other and lawful means of settling such matters. A single combat between champions of hostile nations entered into by public authority for the purpose of terminating the war, or giving courage to the army, would not be a duel, and might be permitted.
p. i, 204
It is never lawful to fight a duel by private authority, for it obviously exposes the parties to grave risk of killing or wounding, or of being killed or wounded, and this is never lawful by private authority except under the conditions which justify killing in self-defence, and these are not verified in the duel. The Council of Trent1 very emphatically condemned duelling as a detestable practice and excommunicated the guilty parties, their seconds and abettors, as well as emperors, kings, and princes who permit it in their territories. This excommunication is renewed by Canon 2351, and the power of granting absolution if it has been incurred is reserved to the Pope. Benedict XIV, by a constitution dated November 10, 1752, condemned the following propositions as false, scandalous, and pernicious: ““(a) A military man who, unless he offer or accept a duel, would be considered cowardly, timid, worthless, and unfit for office in the army, and so would be deprived of his post by which he gains support for himself and his family, or would for ever lose all hope of promotion otherwise due to him, would incur neither fault nor penalty if he offered or accepted a duel.
“‘(b) Those who accept or challenge to a duel for the sake of defending honour or avoiding disgrace may be excused when they know for certain that the combat will not come off, inasmuch as it will be prevented by others. (c) A general or officer in the army who accepts a duel through serious fear of losing reputation or office does not incur the penalties inflicted by the Church on those who fight a duel.”
The contradictory of these false propositions must be held by all who admit the authority of the Church.
p. i, 204–205
Clement VIII, in a constitution dated September 1, 1592, declared that those incurred the penalties of duelling who fought under the stipulation that they would stop after a certain number of blows, or as soon as either was wounded or blood was drawn. Grave sin, then, would be committed by challenging or accepting a duel even under these conditions, at least on account of the scandal and disobedience to authority, if not on account of the danger.
By English and American law duelling is illegal, and if death be the result, it is regarded as murder, and the seconds are liable to punishment as accessories.
p. i, 205