Top wrote:The AMF (American Expeditionary Force) ariving in France was a very welcome reinforcement, as all the German divisions which had been on the Eastern Front were now on the Western Front after the Russian surrender in 1917.
(Possibly another thing they fail to teach in history clssses these days

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Oh indeed. But the main importance of the arrival was mental, because they spent several months repeating the mistakes of all sides that the others had learned through hardwon experience NOT to do during mostly 1914 and 1915.
Because they were no pansies and
they KNEW how to do things... And that´s almost a quote by a US general who will remain unnamed.
And so they ignored most of what the Brits and French told them, up until they had taken sadly large losses for little or no gain, completely unnecessarily.
In a way it´s funny how it´s the French and British that often gets dissed for having their people "charging machineguns", and yet the ones who actually did that the most, despite their small part of the war, were the US troops, apparently their officers thought it was still the US civil war.
And, by late 1917, Germany was falling apart from the inside already(the naval blockade by the Brits were complete murder on Germany, especially food supplies).
And Germany already started talking about possible peace negotiations after Verdun Dec 1916.
And Russia didn´t surrender, there was a ceasefire in late 1917, that Germany broke when 53 divisions began operation Faustschlag in February 1918. At the same time as Russia was falling into civil war. Suffice to say, even with the huge concessions in the Brest-Litovsk treaty March 3, it was still wanted.
And the Russian army had actually began demobilisation in January 1918.
During the first negotiations in Dec -17 Trotski eventually decided to reject the demands of the central powers and was hoping that the unrest in Germany would force them to also quit the war soon enough. He was almost right. 6-9 months later and the German offensive could probably not have happened.
And anyway, US first real participation in WWI wasn´t until Oct 1917, and it wasn´t until May 1918 that it had half a million troops at the front.
The first offensive action taken primarily by US forces came in Sept 1918. And the armistice came 11 Nov -18.
US forces did decently well during those 3 months, but 3 months of serious fighting compared to 4 years for UK/France? Yeah, not exactly a stellar achievement.