Not quite . Ludendorff planned his spring 1918 offensive against the English and French before any great numbers of American troops could arrive . The attack succeeded but it ran out of steam when it's supply became over extended and Australian troops where sent in against it . There where Americans there but not in great numbers.
The English offensive stated on August the 8th , the day Ludendorff called the black day of the German army . American troops came in in much greater numbers toward the end of August and early September . In November the Kaiser fled , the German Republic was declared on Nov. 9th and the Armistice on the 11th.
I knew I was insufficient in the details, but, for my own educational purposes, how far off am I in the understanding that US forces weren’t in long term static defenses?