Ferrié was made a General in 1919 and so remained until his death, having been exempted from retirement rules by a special law of 1930, and became general inspector of military telegraphy.
Ferrié foi nomeado xeneral en 1919 e mantívose en servizo até a súa morte, sendo eximido das normas de xubilación por unha lei especial de 1930, recibindo o cargo de Inspector Xeral da Telegrafía Militar.