With the 5th Battalion of chasseurs under Commandant Carré and the 13th Infantry Regiment under Colonel Lion, the 43rd formed the 1st brigade under the orders of General Véron called Bellecourt.

Engaged for eight months in the sub-sector of Gia Lâm (Tonkin) they have carried out, under the fiery leadership of their chief - Commandant Lejosne, the conquest and pacification of a difficult area between the Canal des Rapides and the Red River.

Called on to participate in the liberation of Hà Đông during the freeing of Nam Định, their cleaning-up operation north of the Rapids bridge won admiration for their energy, their offensive spirit which never shrank from the hardest sacrifices.

On 1 July 2005 the regiment was reorganised to create the 6th RCS of Douai which had: 21 officers, 106 NCOs and 227 voluntary enlisted men divided into two active units: 1 Command & Support (CAS) and 1 CDC.

It contributes, in compliance with NATO criteria to support the deployment of the Headquarters Rapid Reaction Corps – France (RRC-fr) during its operational preparations and during engagements.

Its pennant bears the Croix de guerre des Théâtres d'opérations extérieurs with a citation (9 June 1948) at the order of the army (one palm).