This is an interesting postcard for several reasons:
Charlie and May are visiting the area of Germany where Charlie grew up; the hand-coloring of the postcard photograph is especially well done; the German town of Hadersleben (in Schleswig-Holstein, on the Jutland Peninsula, near the North Sea) reverted to Denmark in 1920.
This area, first settled by Vikings, is so rich in history (including the incubation of the Reformation in Scandinavia) that I encourage readers to search for a history on-line.
In July of 1909, May sent the postcard to Mrs. L. C. Horst of Newton, Kansas.
The face presents a lovely rural scene in Spring- a wagon laden with bales proceeds through a wooded area of blossoming trees.
On the reverse, May describes the relatives and friends they have met.
She indicates that they are moving on to Copenhagen and adds an address where they can be reached there.
One hopes that Mrs. Horst was thrilled to receive the postcard and that the travelers returned safely from their tour.