Translation of: Den 4. våbenart.

Includes bibliographical references (pages 553-557) and index.

During World War II, the resistance movements in the Nazi-occupied countries of Europe became a Fourth Arm of military action on the same level as the other three arms of Allied attack--armies, navies, and air forces. Haestrup profiles the resistance movements as an integral part of the total history of the war. He analyzes their different approaches and levels of resistance in each occupied nation--describing their organization, intelligence-gathering and sabotage achievements, labor strikes, civil disobedience, politics, supplies, external communication, assassinations, and partisan warfare.

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