What events blocked the Schlieffen plan?
The Belgian king did not want Germany to come through their country so he put his army out which gave France time to call the British military in and bring all of their troops to the spot where Germany would attack. They literally drove troops there in taxis. France won at the First Battle of the Marne (Miracle of the Marne). In the meantime, Russians invaded Germany. (side note: after the 1st Battle of the Marne, they began to have trenches)