Lecture Notes on UFO Properties - by Herman Oberth from 1954
For centuries people have seen strange, shining objects in the sky. the oldest reports are found from Plinius and Seneca, according to the Basler National Newspaper, and have been named "Shinning Shields."
There are about 50 observations known from the time before World War II. Then the number of appearances increased; the Allies thought it was a German secret weapon, and the Germans thought it was one of the Allies. Since 1947, the reports of eyewitnesses increased considerably. It is said by the English Air Marshall Lord Dowding that there have been 10,000 (reports) by 1953.