On August 18th, Joffre issued instructions for a French offensive in Belgium, but held back the Third and Fourth armies due to a lack of German troops.
The Fourth Army was ordered to occupy the bridges over the Semois, but not advance into Belgium prematurely.
The Third and Fourth armies launched their offensive on August 20th, with the Fourth Army advancing towards Neufchâteau and the Third Army attacking towards Arlon.
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Joffre issued instructions on 18 August but held back the Third and Fourth armies because air and cavalry reconnaissance found few German troops opposite the two armies, only a large force moving north-west 40–50 kilometres (25–31 mi) away. On 19 August the Fourth army of General Fernand de Langle de Cary was ordered to occupy the bridges over the Semois but not to advance into Belgium until the German offensive began. A premature attack would advance into a trap rather than give time for the Germans to empty Luxembourg of troops before the French advanced. On 20 August the German armies in the south attacked the French First and Second armies and next day the Third and Fourth armies began their offensive. The Fourth Army crossed the Semois and advanced towards Neufchâteau and the Third Army of General Pierre Ruffey attacked towards Arlon, as a right flank guard for the Fourth army. South of Verdun, the Third army was renamed Army of Lorraine and was to watch for a German offensive from Metz, which left the remainder of the Third Army free to concentrate on the offensive into Belgium. The French armies invaded Belgium with nine infantry corps but ten German corps and six reserve brigades of the 4th and 5th armies lay between Metz and the north of Luxembourg.
The German 4th Army under Albrecht, Duke of Württemberg, and 5th Army of Crown Prince Wilhelm had moved slower than the 1st, 2nd and 3rd armies and the French offensive towards them was reported on 21 August. The French armies had few maps and were unaware of the size of the German force opposite, as the Third Army brushed aside small German detachments. On 22 August in the Third army area, the V Corps attacked dug-in German troops at Longwy at 5:00 a.m. in thick fog and heavy rain, with no artillery support.
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