Darmstadt was bombed a number of times during World War II. The most devastating air raid on Darmstadt occurred on the night of 11/12 September 1944 when No. 5 Group of the Royal Air Force (RAF) bombed the city. 66,000 of the 110,000 inhabitants of Darmstadt at the time became homeless. Darmstadt lost between 12,500 and 13,500 inhabitants during World War II. The calligraphic memorial Darmstädter Brandnamen lists about 4,000 names. Darmstadt had several major industrial targets including Merck and Rohm and Haas chemical works as well as military communications networks.