Crossing borders, November 20, 1918.

Advance guard of the 18th Infantry crossing the border line of France and Luxembourg near Aumetz Lux, Lorraine, November 20, 1918.  The 18th was part of the 1st Division and had been in action from the start of American combat participation until the end of the war.  Note that this group of soldiers is entirely equipped with garrison caps and that one of the soldiers is carrying a Chauchat automatic rifle.

Arrival of the first American troops in Belgium, Arlon, Belgium, November 20, 1918.  This street scene is interesting, among other reasons, in that a couple of the men are wearing the type of fedora you'll occasionally see claimed to have not existed until the 1920s. This type shows up in other photos earlier than this, but this photograph gives a good example of them.