At 9am Hitler berates his staff for not building up the southern flank quickly enough thinking the operation will be ruined and defeat is coming. Once again, however, the Germans catch the French High Command napping with more lightning attacks. In the north they cross the Sambre and are reportedly infiltrating the Mormal Forest. Farther south German troops broadly outflank Wassigny, where Gen Giraud has his headquarters. At midday news comes to German army headquarters that Antwerp and Cambrai have been captured. Halder immediately issues orders for panzers to push on to the westwwith reconnaissance forces. He explains the new situation to Hitler who reluctantly agrees to lift the halt order. For the Allies, the situation has again become very confused by the evening. The morning's hopes have been dashed. Saint-Quentin and Péronne have fallen to the German army.

Gen Gamelin orders several units stationed in the Maginot Line to head northwestward in order to strengthen the French positions along the Aisne and in the Argonne. To prevent the French High Command from effecting this maneuver on too large a scale and to compel it to maintain its strength in the fortified sector, the German 1st Army under von Witzleben launches a number of local attacks.

Air Marshal Barratt's Advanced Air Striking Force leaves Rheims for Central France and starts evacuating its units to England.

During the morning Marshal Pétain arrives from Madrid. Accompanied by Reynaud and Daladier, he drives to La Ferté-sous-Jouarre for a talk with Gen Georges and later, around 6pm, he goes on to Vincennes to confer with Gen Gamelin. Technical discussions apart, all he says to Gamelin is: 'I pity you with all my heart.'