Confirmation of this fact is to be found in "A Brief History of the Transvaal Secret Service System, from its Inception to the Present Time," written by Mr. A. E. Heyer, and published at Cape Town in 1899. The writer had held a position in the Transvaal which enabled him to learn many interesting facts concerning the working of the system in question. Among other things he tells how, at Lisbon, every effort was made to obtain a port in Delagoa Bay, and how, "aided by Germany, Dr. Leyds approached Lisbon over and over again with a view to get Delagoa Bay ceded to the Transvaal"; though the Doctor got no more from the Portuguese authorities than a reminder that, under the London Convention of 1884, the South African Republic could conclude no treaty or engagement with any foreign State or nation (except the Orange Free State) until such treaty or engagement had been submitted to the Queen of England for her approval. That Germany, in giving her "aid" in these matters to the Transvaal Republic, was inspired by a regard for the furthering of her own particular schemes is beyond all reasonable doubt; but Mr. Heyer shows, also, that when the negotiations with Portugal were unsuccessful, there was elaborated a scheme under which Germany and the Transvaal were to get what they wanted by means of a _coup de main_. Mr. Heyer says on this subject:-- I have before me a copy of a document, dated Pretoria, August 24, 1892 (the original of which is still in a certain Government office in Pretoria), wherein a Pretoria-Berlin scheme is detailed, namely, "How a few regiments of Prussian Infantry could be landed at Delagoa Bay and force their way into Transvaal territory, and, 'once in,' defy British suzerainty, and for all time 'hang the annoying question of her paramountcy on the nail.'" The name of Herr von Herff, then German Consul at Pretoria, appears on the document. Any one reading this cleverly-planned "Descent on Delagoa" would be readily convinced as to how very easily a German raid on Delagoa territory could be successfully accomplished. This project, also, proved abortive, and, in default of Delagoa Bay, Germany had still to regard her South-West African Protectorate, with its railways and its armed forces, as the base from which British interests were to be wiped out--sooner or later--from the Cape to Cairo. At the time of the outbreak of war in 1914, the principal railways in German South-West Africa--apart from some minor lines which do not come into consideration--were as follows:--