How many kilometers is it from the American Position August 25-29 (Newport) to White Horse following route Horse?

I need more information to answer your question.

* What is the "American Position August 25-29 (Newport)"? Is this a specific location, a historical event, or something else?

* What is "White Horse" referring to? Is this a town, a landmark, or a geographical feature?

* What is "route Horse"? Is this a specific road, trail, or route?

Please provide more context so I can help you find the distance between these locations.