On 26 September 2018 the Frankfurter Allgemeine Zeitung published an article by Paul Ostwald, “Wie günstig! Da kommen plötzlich drei Kriege mehr aus”, which was highly critical of the "Ethics and Empire" project, which Nigel Biggar runs in the McDonald Centre. You can find the article here.
Mr Ostwald's article contained a series of inaccuracies. Professor Biggar therefore wrote a letter to the editor of FAZ, in which he pointed out the false statements and corrected them. This was published on 20 October 2018. You can find the German original of the letter here.
Or you can find an English translation here.