Under a flag of truce the former German military attaché at Brussels who was personally known to General Leman had been sent the day before to persuade or, failing in that, to threaten him into surrender. Leman was told by the emissary that Zeppelins would destroy Liège if he did not let the Germans through. The parley failed of its purpose, and on August 6 the Zeppelin L-Z was duly sent from Cologne to bomb the city. The thirteen bombs it dropped, the nine civilians it killed, inaugurated a twentieth-century practice.