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What if the French opted to follow their Saar Offensive to save Poland...only to find that the Germans are able to bring troops in faster from Poland after they win than the French can attack to any valuable objective?
https://en.wikipedia.org/wiki/Saar_Offensive

The Saar Offensive was a French ground operation into Saarland, Germany, during the early stages of World War II, from 7 to 16 September 1939. The plans called for roughly 40 divisions, including one armored division, three mechanised divisions, 78 artillery regiments and 40 tank battalions to assist Poland, which was then under invasion, by attacking Germany's understrength western front. Although 30 divisions advanced to the border (and in some cases across it), the assault never happened. When the quick victory in Poland allowed Germany to reinforce its lines with homecoming troops, the offensive was stopped. The French forces eventually withdrew amid a German counter-offensive on 17 October.

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

French mobilization suffered from an inherently out of date system, which greatly affected their ability to swiftly deploy their forces on the field.[4] The French command still believed in the tactics of World War I, which relied heavily on stationary artillery, even though this took time to transport and deploy. Many pieces also had to be retrieved from storage before any advance could be made.[5]

So the French would send in the 40 divisions planned, but find that getting them in place quickly enough is a problem, but feed them in as possible...only to find that it is too late and they are stuck in in a major fight in the Saar? The French launch their historical probing attacks on the 7th and they launch their main attack on the 16th, by then pretty much too late for Poland due to Soviet entry, and unlike OTL don't call the offensive off on the 21st of September. So they are pushing in 40 divisions, but find the Germans are bringing in reserves from Poland without impacting the course of operations there; the slow pace of advance means that the French haven't achieved any major objectives and keep running into minefields and various other delaying tactics. What happens then in October as they are stuck in in Saarland, German reinforcements are accumulating, and casualties are mounting?
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