On the morning of 20 May, General Maurice Gamelin, the Commander-in-chief of the French armed forces, ordered the armies trapped in Belgium and northern France to fight their way south, to link up with French forces attacking northwards from the Somme river. On the evening of 19 May, the French Prime Minister Paul Reynaud had sacked Gamelin and replaced him with General Maxime Weygand. Weygand cancelled the orders and after a delay, ordered a similar counter-offensive from the north and south against the German "corridor", to break the encircled armies out of the pocket. In the north the British combined their available divisions with the 50th infantry division which was holding the Vimy area to create a contingent which was code-named Frankforce. Frankforce was to hold the line of the river Scarpe to the east of Arras with the 5th Infantry Division, while the rest of the force attacked to the south of Arras and the new French 3 ( Antoine-Marie-Benoît Besson) attacked north from the Somme.