The French attack on Saarland was a French sortie into the Saarland in the early stages of World War II. The purpose of the attack was to assist Poland, which was then under attack. However, the assault was stopped and the French forces withdrew.

According to the Franco-Polish military convention, the French Army was to start preparations for the major offensive three days after the mobilisation starts. The French forces were to effectively gain control over the area between the French border and the German lines and were to probe the German defences. On the 15th day of the mobilisation (that is on September 16), the French Army was to start a full scale assault on Germany. The pre-emptive mobilisation was started in France on August 26 and on September 1 the full mobilisation was declared.

A French offensive in the Rhine river valley area (Saar Offensive) started on September 7, four days after France declared war on Germany. Then, the Wehrmacht was occupied in the attack on Poland, and the French soldiers enjoyed a decisive numerical advantage in their border with Germany. However, the French did not take any action that was able to assist the Poles. Eleven French divisions (out of 102 being mobilized) advanced along a 32 km line near Saarbrücken with negligible German opposition. The French Army has advanced to a depth of 8 kilometers and captured about 20 villages evacuated by the German army, without any resistance. However, the half-hearted offensive was halted after France seized the Warndt Forest, three square miles of heavily-mined German territory.

The attack did not result in even one German soldier from Poland returning to the west. The all-out assault was to be carried out by roughly 40 divisions, including one armoured division, three mechanized divisions, 78 artillery regiments and 40 tank battalions. All the necessary forces were mobilised in the first week of September. On September 12, the Anglo-French Supreme War Council gathered for the first time at Abbeville in France. It was decided that all offensive actions were to be halted immediately. By then the French divisions have advanced approximately eight kilometres into Germany on a 24 kilometres long strip of the frontier in the Saarland area. Maurice Gamelin ordered his troops to stop not closer than 1 kilometre from the German positions along the Siegfried Line. Poland was not notified of this decision. Instead, Gamelin informed marshal Edward Rydz-Śmigły that half of his divisions are in contact with the enemy, and that French advances have forced the Wehrmacht to withdraw at least six divisions from Poland. The following day the commander of the French Military Mission to Poland General Louis Faury informed the Polish chief of staff, general Wacław Stachiewicz, that the planned major offensive on the western front had to be postponed from September 17 to September 20. At the same time, French divisions were ordered to retreat to their barracks along the Maginot Line. The Phony war started.

See also

• Phony War
• Western betrayal

Battle of France | World War II politics | World War II Western European Theatre