I whakaingoatia a Doyle hei Knight of Grace o te Order of the Hospital of Saint John of Jerusalem i te tau 1903. He kaitautoko a Doyle mo te pakanga mo te whakahou i te Kawanatanga Koreutu o Kongo, na te kairipoata a ED Morel me te kaitono a Roger Casement. I te tau 1909 i tuhia e ia Te hara o te Kongo, he pukapuka roa i whakahe ai ia i nga whakamataku o taua koroni. I mohio ia ki a Morel me Casement, ana pea, i uru tahi me Bertram Fletcher Robinson, i whakaaweawe i etahi tohu i roto i te pukapuka The Lost World i te tau 1912. I pakaru a Doyle ki a Robinson i te wa i riro ai ia hei kaiarahi o te nekehanga pacifist i te Easter i te Pakanga Tuatahi o te Ao.
Ko te Hē o te Rōpū o Kongo