During the year 1942, according to information from England, about 1000 attacks were flown on German territory, including 17 heavy attacks with a quantity of more than 500 tons of bombs and incendiary's. In 1944 this figure increased almost fivefold to about 1.6 million tons. The German arms industry was not crucial affected by these attacks, on the contrary, in December 1944, the monthly output reached its absolute peak. In 1944, the Wehrmacht was on the retreat on all fronts. Gradually, the main battle lines moved ever closer to the Reich.