[1] Adam Hochschild, in his bestselling King Leopold's Ghost, praised Marchal's work as "the best scholarly overview by far, encyclopedic in scope".
[2] In the mid-1970s, Marchal first read that it was believed in the Anglo-Saxon world that under Leopold II half of the native population had perished, approximately ten million people[3] He went to do archival research to debunk this, but on the contrary he came across truths about the reign of terror that were previously unknown to him.
Towards the end of his career, he began to publish a steady stream of bulky studies on the subject.
Marchal, for his part, considered the work of Belgian historians on the colonial period law-abiding and respectable.
[4] According to Marchal, this was the reason why Jan Vansina, approached by Hochschild with the question of whom to contact, did not refer him to classical authorities such as Jean Stengers or Jean-Luc Vellut, but to the outsider from Limburg.