During the Battle of France in 1940, the 4th Armoured Division (Major-General Charles de Gaulle) and elements of the 1st Army Tank Brigade (British Expeditionary Force) made probing attacks on the German flank, pushing into the rear of the advancing armoured columns at times. This may have been a reason for Hitler to call a halt to the German advance. Those attacks combined with Maxime Weygand's Hedgehog tactic would become the major basis for responding to blitzkrieg attacks in the future: deployment in depth, permitting enemy or "shoulders" of a penetration was essential to channelling the enemy attack, and artillery, properly employed at the shoulders, could take a heavy toll of attackers. While Allied forces in 1940 lacked the experience to successfully develop these strategies, resulting in France's capitulation with heavy losses, they characterised later Allied operations. At the Battle of Kursk the Red Army employed a combination of defence in great depth, extensive minefields, and tenacious defence of breakthrough shoulders. In this way they depleted German combat power even as German forces advanced. The reverse can be seen in the Russian summer offensive of 1944, Operation Bagration, which resulted in the destruction of Army Group Center. German attempts to weather the storm and fight out of encirclements failed due to the Russian ability to continue to feed armoured units into the attack, maintaining the mobility and strength of the offensive, arriving in force deep in the rear areas, faster than the Germans could regroup.
As long as Rosé remained in charge of the orchestra, it maintained a fairly high level of skill and a large repertoire. The musicians participated in strenuous rehearsals and even more stressful concerts and private performances. Although the vast majority of their music-making was (with the exception of the daily march music) for the benefit of the SS and the small group of ‘elite’ prisoners, the orchestra would occasionally give special concerts to the regular inmates, and make visits to the infirmary. However, upon Rosé's sudden and mysterious death on 4 April 1944, the orchestra began to slowly crumble. Rosé was replaced by the Ukrainian pianist and copyist Sonya Winogradowa, who, although liked by the other musicians, was not a particularly effective leader. At the end of 1944, the non-Jewish members were sent to Auschwitz I, while the Jews were deported to Bergen-Belsen. Relatively many survived the war.
By July 1944, Germany was losing the war; the SS began closing down the easternmost concentration camps and deporting the remaining prisoners westward. Many were killed in Auschwitz and the Gross-Rosen concentration camp. Schindler convinced SS-Hauptsturmführer Amon Göth, commandant of the nearby Kraków-Płaszów concentration camp, to allow him to move his factory to Brněnec in the Protectorate of Bohemia and Moravia, thus sparing his workers from almost certain death in the gas chambers. Using names provided by Jewish Ghetto Police officer Marcel Goldberg, Göth's secretary Mietek Pemper compiled and typed the list of 1,200 Jews who travelled to Brünnlitz in October 1944. Schindler continued to bribe SS officials to prevent the execution of his workers until the end of World War II in Europe in May 1945, by which time he had spent his entire fortune on bribes and black market purchases of supplies for his workers.