In many conquered lands, the Germans made promises of independence or the redress of ancient ethnic disputes. In some cases they followed through, but most natives who hailed the Germans as liberators were quickly and sharply disabused of their illusions.
Different areas were controlled differently. In many places the Germans set up provinces that were incorporate into Germany, each run by a Gauleiter who held absolute power. In the vast areas of Russia, the Germans held little territory but used armored trains and tanks to project power anywhere. Collaborationists that worked with the Germans ran areas like Vichy France.
Especially after the losses in Stalingrad and Kursk, the Gauleiters were instructed to send resources to Germany. Besides natural resources, thousands of slave laborers were shipped into Germany to work in war production and other areas.
The romantic view of French Maquis fighting a hit-and-run battle while wearing black berets underestimates the horror and death that most resistance fighters lived for their short lives as partisans. Communists under the direct control of the Soviet Union organized much of the resistance in occupied Europe. This fact is often overlooked as the cold war precluded celebrating their actions.
The Gestapo was ruthlessly efficient in destroying resistance cells, and many resistance fighters died in torture or in concentration camps. Thousands of innocent men, women and children were killed in reprisals. Resistance often began as soon as the country was occupied. Defeated soldiers would hide their weapons in case of uprising; journalists and printers would hide their presses for future use. Often those Army officers willing to continue the fight would carry on after their government had surrendered.
By July 1940, it became clear to the British that they were not going to return to the continent anytime soon, and began to organize intelligence units to support partisans around occupied Europe. Called Special Operations Executive (SOE), it organized espionage and sabotage operations, supplied and trained guerilla units, and was the model for the US Office of Strategic Services.
When Czech SOE agents killed SS Chief of the Reich Central Security Office (RSHA) Reinhard Heydrich in 1942, the Germans destroyed the town of Lidice, Czechoslovakia on June 10, 1942. The men were shot, the woman and children deported, and the town blown up and covered over. The name was removed from all German maps.
The effectiveness of resistance varied by country. In Germany, resistance movements were largely ineffective and were eliminated before the war. The best known is the Weisse Rose (White Rose) which was their password. Two University of Munich students, brother and sister Hans and Sophie Scholl, organized students and soldiers opposed to the Reich in 1942. One soldier had seen the Einsatzgruppen (Action Groups) that shot Jews on the Eastern Front. In February 1943, they dropped leaflets critical of Hitler that said Germanys name will be disgraced forever, from their Universitys window. Both were arrested, tortured, and sentenced to death. Sophie, her leg broken by the Gestapo, was beheaded.