Germany had not fully mobilized in 1939, nor even in 1941. Not until 1943, under Albert Speer (the minister of armaments in the Reich), did Germany finally redirect its entire economy and manpower to war production. Instead of using all available Germans, it brought in millions of slave workers from conquered countries, treating them badly (and getting low productivity in return).[89] Germany's economy was simply too small for a longer all-out war.