If the acts are committed in the presence of the enemy, rebels or an armed band, the penalty shall be military detention for life. CHAPTER 3: OFFENSES AGAINST DISCIPLINE Section 1: Revolt Article 538: Military personnel shall be in revolt if they: 1° having weapons and being in number of at least four, refuse at the first summons to obey the orders of their superior; 2° at least four soldiers together, take up arms without authorization and act against the orders of their commander; 3° gathered in number of at least eight, engage in violence by using weapons and refuse to disperse and return to order at the call of the qualified authority. Article 539: The penalty shall be: 1° three to five years of military detention in the case of the first paragraph of the preceding article; 2° from five to ten years of military detention in the case of the second paragraph; 3° from ten to twenty years of military detention in the case of the third paragraph. Military detention for life shall be incurred if the revolt takes place in the presence of the enemy, rebels or an armed band. Life imprisonment may be applied to the highest ranking soldiers and to the instigators of the revolt. Article 540: If the revolt takes place in time of war, or in a territory in a state of siege or emergency, or on board a ship or aircraft, the penalty may in all cases be increased to twenty years of military detention and the instigators shall be punished with life imprisonment. Section 2: Rebellion Article 541: Any attack, resistance with violence or assault against the armed force or agents of the Authority committed by a military person shall be punishable: 1° from two months to one year of military detention if the rebellion takes place without a weapon; 2° from one to three years of military detention, if the rebellion takes place with a weapon.