Halsall s article is 20 pages long pp 35 55 So there is a lot more to it than the two page PDF He may complain about the term Barbarian Invasions but it s the one he uses As for Delbr ck I think its significant that the main current translation uses Barbarian Invasions After all we want to follow English usage and not German Even while Britannica s ancient Rome article uses Barbarian Invasions their Germany article uses Migration Period So it s primarily a question of whether you re viewing events through the Roman or German end of the telescope