The effects of the German anti-aircraft 'flak' units was devastating and only got worse as the guns were withdrawn from France and Holland-Scandinavia. They estimated that in Berlin in 1944, 10,00 guns protected the city. This is a cut account from the B.17. raids on Schweinfurt Ball Bearing Plant.
“ As soon as the reconnaissance photographs were received on the evening of the 17th, Generals Eaker and Anderson knew that the Schweinfurt raid had been a failure. The excellent results at Regensburg were small consolation for the loss of 60 B-17s. The results of the bombing were exaggerated, and the high losses were well disguised in after-mission reports. Everyone who flew the mission stressed the importance of the escorts in reducing losses; the planners grasped only that Schweinfurt would have to be bombed again, soon, in another deep-penetration, unescorted mission
The 60 aircraft lost on a single mission more than doubled the highest previous loss at that time. 87 additional aircraft were damaged beyond economical repair, or had to be left behind in North Africa because of a lack of repair facilities, for a total loss of equipment to the Eighth Air Force of 147 B-17's (many of the 60 left behind in Africa were repaired and continued service with the Twelfth Air Force). 95 additional aircraft were damaged. Three P-47 Thunderbolts of the 56th Fighter Group and two RAF Spitfires were shot down attempting to protect the Schweinfurt force.
(60 bombers lost, each with a crew of 10, making it 600 men killed or captured)
The Luftwaffe installed massive batteries of anti-aircraft batteries called Fliegerabwehrkanone. The Allies began calling the resulting shells and shell fragments tearing through their planes flak. The Germans produced a range of these artillery pieces, including light, medium, and heavy artillery pieces. The artillery ranged in size from 12.7-128 mm flak guns. The light and medium guns were used to protect German field armies as well as facilities like important bridges, ports, and dams fim low-level attck. The heavy batterie were used to target the high-altitude strategic bombers. The Germans by 1942 had installed . over 15,000 88 mm flak guns in cannons Flak belts stretching across the route into the Reich's industrial heartland. They streached grom the Netherlands through Belgium and western Germany. At some points they were 20 km thick. The Flak batteries were an important part of the Kammhuber Line. The Germans had radar directed batteries and searchlights to direct the fire. There were also Flak batteries installed around major German cities and high priority tasrgets like Ploesti and U-Boat facilities
Formations
The Luftwaffe deployed rectactular formations of as many as 40 88-mm guns in Grossbatterien able to deal out box Flak barrages. The German Flax units at firt faced relatively small-scale RAF night raids. A standard Flak battery early in the War consisted of two or three groups of 6 guns. As the air war increased in intensity, the Germans began deploying8 guns in each group. The American 8th Air Force joined the air war in force and began day light bombing (1943). With the entry of the Americans into the daylight bombing raids and intensified Bomber Command night raids, the Luftwaffe began grouping two or three Flak batteries together under a single command post to direct the firing. The 88 mm heavy Flak guns were normally deployed in semi-permanent batteries intended to provide long-term protection in the western Flak belts and important targets like indudtrial cities and petroleum refuineries and synthetic fuel plants. The 88s were mobile guns and could easily be dismounted to be redeployed. .
Flak Towers
One inovation intriduced by the Germans as the air war escalated was the Flak Tower. They were bult in large cities like Berlin, Hamburg and Vienna. They were large virtually indestructable structures rising high in the cities and built with reinforced concrete. They were topped with four heavy guns, either 105mm or 128 mm guns. They were built in pairs to support each other. They also served as effective bomb shelters.