The Actions of 30 September – 4 October 1917 were German methodical counter-attacks (Gegenangriffe) during the Third Battle of Ypres in Flanders, during the First World War. Hasty counter-attacks (Gegenstöße) by the German 4th Army during the Battle of the Menin Road Ridge on 20 September and the Battle of Polygon Wood on 26 September, had been costly failures. On 29 September, a review was held at Roulers by Erich Ludendorff the Generalquartiermeister (Quartermaster-General of the German Army, equivalent to the British Chief of the General Staff) with the commanders of Heeresgruppe Kronprinz Rupprecht von Bayern (Army Group Rupprecht of Bavaria) and the 4th Army staffs.