 In the Imperial Brazilian Navy, Prince Augusto arrived at the post of second lieutenant (equivalent, now the first lieutenant), serving on board the "Niterói" Corvette, the battleship Riachuelo and the Cruiser "Almirante Barroso", in addition to being the helper of orders of Admiral Eduardo Wandenkolk, future republican leader.On November 15, 1889, the prince was in the East, on board "Almirante Barroso" - who was on his first circumnavigation trip - when a coup d'état ended the monarchist regime in Brazil.Communication difficulties prevented the crew from learning about what happened before December.