By 1942, most of Continental Europe was either a member of the Axis Powers (e.g., Italy, Romania, Finland) or under the occupation of Germany. Large parts of the Soviet Union (e.g., the Baltic states, Byelorussia, Ukraine) of the most fertile and productive lands and a vast population was now at the mercies of the Nazis. Meanwhile a puppet government was installed in France under famed WWI general Philippe Pétain known as the Vichy regime. While calling itself the legitimate government of France, the Vichy regime mostly cooperated with Nazi Germany by providing forced laborers and helped the S.S. to Jews who hid to escape capture.
A poster from the Vichy period shows a disintegrating France on the left, with words like "communism" and "Jewishness" causing the foundation to crumble. On the right are the words of Pétain's France: "work, family, fatherland."
Vichy’s decline was paralleled by the rise of the anti-German underground. Within weeks of the 1940 collapse, tiny groups of men and women had begun to resist. Some collected military intelligence for transmission to London; some organized escape routes for Allied airmen who had been shot down; some circulated anti-German leaflets; some engaged in sabotage of railways and German installations. The Resistance movement received an important infusion of strength in June 1941, when Hitler’s attack on the Soviet Union brought the French Communist Party into active participation in the anti-German struggle. It was further reinforced by the German decision to conscript French workers; many draftees took to the hills and joined guerrilla bands that took the name Maquis (meaning “underbrush”).
Over the course of the war, the French Resistance scored key victories against the German occupations forces. Resistance members tracked and ferreted-out French collaborators, assassinated many ranking Nazi officials, tapped the phones of the Abwehr's (German intelligence) Paris headquarters, and destroyed trains, convoys, and ships used by the German army. The resistance provided Allied forces with invaluable human intelligence resources and aided Allied troops who fell behind enemy lines. Resistance groups shielded political dissidents, refugees, and Jews escaping the Holocaust. They also helped in preparing for the D-Day invasions by attacking key communication centers and rail lines.
These numerous accomplishments carried a heavy price. German agents often infiltrated partisan groups, despite security precautions. When they captured a maquis, Gestapo agents employed torture as means of extracting the names of other resistance members. The Gestapo occasionally carried out bloody reprisals on innocent civilians after partisan sabotage operations. As many as 25,000 French men and women, members of the resistance and those suspected of aiding their cause, were sent to German concentration camps. Another 25,000 were executed in France by Gestapo agents, including the population of an entire Northern French village.
“Victory is approaching. There are still Frenchmen who have done nothing to hasten the event. Warning! There is not much more time. It is not enough to listen to the radio from London or to read Combat, one must fully involve himself. Take risks, be ready to fight. In the new France, a man will be judged by his acts. We are accepting workers of the eleventh hour. Soon it will be noon!” (Leaflet printed by the "Combat" Resistance group)
Source(s): Encyclopedia Britannica, Encyclopedia.com, Spartacus Education