At this time, Troop 1, "Commandos Français", was formed with the intention of raising the unit to a battalion of 400 personnel in readiness for the expected offensive operations in Europe.

Members of Troop 1, under the command of Lieutenant (Navy) Kieffer, took part in the raid on Dieppe (Operation Jubilee) with the British and Canadian commandos on 19 August 1942.

[4] French commandos took part in the raid on the beach of Wassenaar in Holland on 28 February 1944, the site of V-2 rocket launches, during which six of them, including Captain Charles Trepel, were killed.

[11] In spite of significant losses, the commandos seized the 50 mm anti-tank gun encuvée – an armoured artillery position like a small bunker – which had disabled LCI 523 (1Re Troop).

They then took the former Casino de Riva-Bella before advancing between Colleville and Saint-Aubin-d'Arquenay to meet the British paratroopers of the 6th Airborne Division at Pegasus Bridge (Bénouville), arriving around 16:30 hours.

In November 1944, the 1er BFMC was landed on the island of Walcheren in Holland and took Flessingue as part of a combined arms operation undertaken by the British and Allied commandos.