After the 1917 French Mutinies

I've heard it said that after the Mutiny of 1917 the French troops were basically told to hold on and wait for the Americans. It was the prospect of the Americans coming that kept them going. I know that General Petain called an end to all offensives. I'd be interested to know whether or not this is true and if it is true, what happens if the Americans do not enter the war?
 
Hmmmmm,
Well, I think it's correct that by the summer of 1917, Britain recognised that the French were becoming increasingly exhausted and that British forces would have to bear the brunt of offensive action. In fact the series of battles that became known as 3rd Ypres or Paschendael had originally been planned as an operation for the summer of 1916 which had been called off due to the need to commit more troops to the Somme offensive as the French in turn were tied down at Verdun.
Whether there was ever a stated policy of 'wait for the Americans' I don't know, though that seems to have been the defacto position.
Interestingly there was a lot of pressure on the US to commit its troops, not as a separately organised national army, but as battalion or regimental sized reinforcements to existing French units. 'Black Jack' Pershing (among others) resisted this, but in turn the need to maintain their independance led to a lack of willingness to allow US troops to become aclimatised to trench warfare under British or French guidance. This in turn meant that US troops had to re-learn (with accompanying heavy casualties) lessons already learned by the British and French.
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As regards the USA not entering the war, are we talking about a path of generally less US involvement from the start of the war (which could drastically affect the Allies supply position)? If this is the case, how might this come about, given the situation regarding unrestricted submarine warfare etc?
Or is it just that the 1917 'war decision' goes the other way, which may mean only a delay in US entry, in turn delaying US build up in Europe?
Or does the US INCREASE its supply to the allies (if indeed that was possible) asthe price of remaining, at least on paper, a non-belligerant.
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Let us say that the US does not enter the war, but the supply position remains as OTL.
This means that the British and French face the March 1918 Spring Offensives without the prospect of US military forces becoming involved. I don't think the Brits would fight any the less well, but the pressure on the French to conclude an armistice to end the pain would be immense, and the Russians had already done it.
This could be the ultimate butterfly effect, a literal single butterfly fluttering across a desperately French-held trench in the spring of 1918, turning one soldier's thoughts to the vision of peace, at last, and that thought making him open his mouth, and speak up to his comrades of that dream, in defiance of the officers..............
 
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