Everything you say about Tonkin. is very fair, this one is a dangerous toy.
Source, in full
All the King's Men' A search for the colonial ideas of some advisers and "accomplices" of Leopold II (1853-1892). (Hannes Vanhauwaert), 4. Viceroys without colonial aspirations? Jules Devaux (1828-1886) Jules Devaux on June 28, 1876 In a letter to Beyens about the later French protectorate in North Vietnam, where Leopold II had hatched a colonial plan together with a docile baron Beyens. STENGERS, J. “Leopold II between the Far East and Africa 1875-1876”, 348. Zie ook infra: hoofdstuk 8, 95-97.