5 April - The steamship Paraná, loaded with coffee and travelling in accordance with the demands made on neutral countries, is torpedoed by a German submarine; three Brazilians are killed.
11 April - Brazil breaks off diplomatic relations with Germany.
7 May - Foreign Minister Lauro Müller is obliged to resign because of his German origins.
20 May - The ship Tijuca is torpedoed near the French coast by a German submarine.
27 July - The steamer Lapa Brazil is hit by three torpedoes from a German submarine.
23 October - The Brazilian freighter Macau, one of the vessels seized in the course of the war, was torpedoed by the German submarine SM U-93 near the coast of Spain, and the captain taken prisoner.
1 November - A mob damages German property in Petropolis, including the restaurant Brahma (completely destroyed), the Gesellschaft Germania, the German school, the company Arp, and the German Journal.
4 November - Acari Guaíba and another ship are torpedoed by the same German submarine, SM U-151.
^Faria, Ivan Rodrigues de. "Participação do Brasil na Primeira Guerra Mundial" (Portuguese) ('Brazil's participation in World War I') Brazilian Army Journal, Rio - DPHCEx, 1996 (Page 67)