One of the interesting aspects of the first World War was that the allies repeatedly accused Germany of using expanding bullets, nicknamed ‘dum dum’ rounds. Accusations went back and forth in the newspapers of the day and this eventually resulted in a change in the German attitude. The switchover from the conical shaped 9mm Parabellum bullet to the, still familiar, conical bullet was one of the results of these discussions.
I recently found a small article, dating from September, 1914, which actually mentions the make and maker of the rounds that were found. It was published in a Dutch newspaper (The Netherlands remained neutral during WW1):
Dutch National Archives
De Tijd : godsdienstig-staatkundig dagblad
Edition: 28-09-1914, Morning.
[i]The germans are using dum-dum bullets.
Antwerp, 25th of September. It cannot be denied that the germans have repeatedly used dum-dum bullets and are still using them. Several cases of wounds caused by dum-dums have been confirmed on Belgian soldiers, wounded in the battles that took place between Mechelen and Leuven between the 2nd - 12th of September (1914). The cases have been validated by several doctors and were noted officially with the names of the victims and witnesses.
I was not surprised by these reports. Some 8 days ago I received from the secretary of the committee that researches violations of international rights and martial laws, which were found on a soldier who was captured at Werchter.
And today the committee received a full box of dum-dum cartridges for selfloading pistols, found in the possession of Oberleutnant Von Hadeln from Hannover, captured during the 24th of this month at Ninave.
The package was sent by Luitenant General Clooten, commander in chief for Flanders and is, according to the printed information on the outside, produced by the Deutsche Waffen- und Munitionsfabriken, Karlsruhe.
The cartridges are No. 403 for the Mauser Selfloading Pistol, Cal. 7.63.
What I report here I have seen with my own eyes.
Frans van Cauwelaert.[/i]