the pre-war Polish defensive plan (see Plan West) was abandoned. Śmigły-Rydz, however, hoped that the retreat would save Kraków Army from complete destruction. The Retreat In the evening of Saturday, Sept. 2, the order to retreat reached Polish units. Kraków Cavalry Brigade, together with the 7th I.D. was to move towards Jędrzejów, halting the advance of the 2nd Light Division. 22nd Mountain I.D. was to withdraw towards Olkusz, and to support Operational Group Silesia (renamed into Operational Group Jagmin), which itself was to retreat behind the Przemsza. Operational Group Bielsko (renamed into Operational Group Boruta) was to withdraw behind the Skawa, and to take positions between Zator and Wadowice. General retreat towards the Dunajec and the Nida was to begin in the night of September 2/3.. General Szylling specified that units located in the centre of the front were to retreat first, to avoid being surrounded by German panzers advancing fast both in the north and the south. This plan failed, as Polish 7th I.D. was completely destroyed in the morning of Sunday, September 3, by the 14th Infantry Division, the 4th Infantry Division, and the 2nd Light Division. The retreat itself did not improve the situation of Kraków Army, as it lost its fortified defensive positions, together with heavy equipment, which was abandoned. Polish historians Czesław Grzelak and Henryk Stańczyk in their book "Kampania polska 1939 roku" write that several historians question the decision of General Szylling, as in their opinion the decision to withdraw eastwards on the second day of the war was premature. Tadeusz Jurga wrote: "To remain in defensive positions would result in halting the advance of the German 10th Army, which later destroyed Prusy Army (...) Furthermore, defensive positions of Kraków Army were based on fortifications, which had been built before the war. These fortifications eliminated technological superiority of the Wehrmacht. To abandon them and to fight in the open lowered defensive abilities of Kraków Army". The decision to abandon southwestern Poland had far-reaching consequences, as Kraków Army was the centre point of the defensive plan. Its new line of defence along the Dunajec and the Nida was ill-prepared, and the retreat itself turned out to be very difficult, as Polish units were under constant pressure of the Luftwaffe and German motorized divisions. In the morning of September 3, General Szylling ordered general retreat east of Kraków, dividing his army into Operational Group Jagmin (north