a conflict where there is hope for a peaceful resolution but troops are mobilizing for action in history

In the world war one, Britain had hoped to solve the difference between Serbia and Austria, but in July 1914, no one even Britain has taken a public position in this possible war.

With the assassination of the Archduke Ferdinand in Sarajevo was the detonating in July crisis, Germany started a mobilization, Britain didn't have a position yet, while Germany and France pushed them.