Related Rule
Practice Relating to Rule 106. Conditions for Prisoner-of-War Status
Section B. Levée en masse
The Military Manual (1993) of the Netherlands states that participants in a levée en masse are considered as combatants if “they carry arms openly and comply with the humanitarian law of war”. 
Netherlands, Toepassing Humanitair Oorlogsrecht, Voorschift No. 27-412/1, Koninklijke Landmacht, Ministerie van Defensie, 1993, pp. III-1 and III-2.
The Military Manual (2005) of the Netherlands states that combatants include: “the population of an unoccupied area which spontaneously takes up arms when the enemy approaches, to repel the invading troops. This is called a mass uprising. The requirement is that they openly bear arms and obey the rules of the humanitarian law of war.” 
Netherlands, Humanitair Oorlogsrecht: Handleiding, Voorschift No. 27-412, Koninklijke Landmacht, Militair Juridische Dienst, 2005, § 0304.