What role did the BEF play in the failure of the Schlieffen plan

What role did the BEF play in the failure of the Schlieffen plan The British expeditionary force or the BEF became involved in the war because of Belgium. The Germans decided to go through Belgium as part of the Schlieffen plan, and though they knew that the British might become involved they didn't think that they would and they also felt they didn't need to fear the tiny British force.The Schlieffen plan expected the Belgians to give in when the Germans marched through the country. However they instead fought the Germans and though they wee massively outnumbered the resistance brought time for the British and French to get their troops in to the war to help Belgium. The French were fighting the war on another front so the main force with the Belgium's was British. This force can quite possibly be said to be key to the failure of the Schlieffen plan as although they were hugely outnumbered they combined with the Belgium's slowed the Germans down enough that the 6-week period the Germans had allocated to take France was impossible to achieve.Map o f Western front (World war I) 1914 (ru)