Dear Kees Verduin,
Josephus' view (Antiquities 1.64) is also found in rabbinic tradition (Midrash Genesis Rabbah 23.3, where we find that Tubal-cain, the first who knew how to sharpen iron and copper, furnished the instruments used in war and combats. Philo (De Posteritate Caini 34.116-17), like Josephus, speaks of Tubal-Cain's concern with bodily pleasures and the art of war. The connection of the invention of the forging of metal with the art of war is similarly made in Ovid's account of the Iron Age (Metamorphoses 1.142-43). The statement that Tubal-Cain distinguished himself in the art of war, procuring thereby the means of satisfying the pleasures of the body, is reminiscent of Lucretius' attack on war (5.1000-1). If you will look at Antiquities 1.70-71, in connection with Adam's prediction that the universe would be exterminated by alternately a fire and water, mankind made two pillars to inscribe their findings. There is a similar account in the Chronicles of Jerahmeel 24.7 and parallel passages cited by Moses Gaster (in one of his books: I do not have the title: perhaps it is the Book of Asatir), where TubalCain is described as the one who made the pillars or tablets. Pseudo-Philo,Biblical Antiquities 2.9 says that he showed man arts in lead and tin and iron and copper and silver and gold and that then the inhabitants of the earth began to make sculpted objects and to worship them. On this see Howard Jacobson's commentary on Pseudo-Philo, vol.1, pp. 303-5. You might also want to consult Umberto Cassuto's commentary on Genesis, Part 1, and Ephraim Speiser's commentary on Genesis in the Anchor Bible series. Best wishes.
Louis Feldman