confronted by the German 3rd Army and 2nd Army from the east and the north. Before the Fifth Army could attack over the Sambre the 2nd Army attacked at the Battle of Charleroi and at Namur on 21 August. The 3rd Army crossed the Meuse and attacked the French right flank and on 23 August, the Fifth Army began a retirement southwards to avoid encirclement. After the Battle of St. Quentin, the French withdrawal continued. On 22 August the BEF advanced and on 23 August fought the Battle of Mons, a delaying action against the German 1st Army, to protect the left flank of the French Fifth Army. The BEF was forced to retreat when the 1st Army began to overrun the British defences on the right flank and the Fifth Army retired from the area south of the Sambre, exposing the British right flank to envelopment. Namur capitulated on 25 August and a Belgian sortie from Antwerp led to the Battle of Malines After the French defeat during the Battle of Lorraine, the French Second Army retreated to the Grand Couronné heights near Nancy and dug in, on an arc from Pont-à-Mousson to Champenoux, Lunéville and Dombasle-sur-Meurthe by 3 September. The Battle of Grand Couronné (4–13 September) began next day, when the German 7th and 6th Armies attacked simultaneously at St. Dié and Nancy, as the Second Army sent reinforcements to the Third Army. Costly fighting continued until 12 September but the French were able to withdraw more than four corps to reinforce the armies on the left flank. On 13 September, Pont-à-Mousson and Lunéville were recaptured by the French and the advance continued close to the Seille river, where the front stabilised. The battles kept a large number of German troops in Lorraine, as the Great Retreat further west culminated on the Marne. The Great Retreat, 24 August – 5 September The French Fifth Army fell back about from the Sambre during the Battle of Charleroi (22 August) and began a greater withdrawal from the area south of the Sambre on 23 August. The BEF fought the Battle of Mons on 24 August, by when the French First and Second armies had been pushed back by attacks of the German 7th and 6th armies between St. Dié and Nancy, the Third Army held positions east of Verdun against attacks by the 5th Army, the Fourth Army held positions