After the death of Richelieu the musketeers rescue one of his spies, Rochefort, from a lynch mob and take him to see the king. He explains that he has escaped from a Spanish jail but that the French general De Foix and his sister are still prisoners and asks that the musketeers help him free them. The mission is accomplished and Rochefort is appointed as Richelieu's successor - but can he be trusted? Meanwhile Queen Anne, having recently given birth to a son, appoints Constance as her confidante.
don @ minifie-1
Did You Know?
D'Artagnan remarks that when the musketeers would be caught in disguise, they would be executed as spies. Apart from the fact that their 'soft leather harnesses in all kinds of shades and shapes' hardly look like a decent uniform (mousquetaires de la garde wore colourful white-red-blue uniforms), it was only at the first Hague convention (1899) that a sharp distinction between the treatment of combatants with and without proper uniform was discussed (and only included.in the second convention of 1907). Before that, the exact garment of a soldier was not that crucial.
Moreover, the musketeers weren't spying either (clandestine intelligence gathering), neither on a sabotage mission - acts and goals that would outweigh what they wore.
And given the amount of violence and shooting, d'Artagnan's worry about a possible execution seems trivial.
The anachronistic remark only serves to show how much he likes his team colours and is reluctant to shed them, even for tactical reasons. See more