This document presents information on attacks and on civil defense activities in the city of Hamburg, Germany, during and after the large scale attacks that started on July 25, 1943. Many eyewitness reports of events during the air attacks from July 25 to August 3, 1943, are quoted. Numerous illustrations show attack damage sustained by the city as well as civil defense activities initiated to counter the effects of the attack. A collection of police bulletins and newspaper articles from the period July to December, 1943, document the restoration of the civil defense forces and the implementation of police security measures to prevent looting and disease epidemics, to identify missing persons, and to restore public utilities to the city. Expert medical opinion is presented on the dangers of epidemics caused by corpses and on the causes of death from the attacks as revealed by autopsy findings. A descriptive and profusely illustrated section gives detailed information on the performance and use of air raid shelters.