The English were retreating, and kluck was following hard after them.
Between them kluck was to be destroyed and his rout would expose the flank and rear of all the German forces in France.
Whatever the reason was, von kluck suddenly began marching south-east.
kluck took Brussels on August 18, 1914, and turned south, meeting the first serious resistance at Mons.
Foch's success was decisive, kluck and Blow began their retreat, leaving their own fights undecided.
kluck turned back from pursuing, and the English went on unharmed.