Origins
The  origins of the Imperial Navy was full of obstacles. By the time Brazil achieved its  independence, the war fleet at disposal of the new-born country relied on  7 vessels  and some small  ships(merchantmen converted into war vessels). At the same time, the Portuguese fleet  present at the coast was formed of 13 ships and some others small vessels..
Meanwhile, the crew aboard the brazilian ships were at most constitued of Portuguese seamen and foreigners. Thus, the seamen was not entirely reliable to the cause of Brazil's independence. Even the officers were Portuguese or Englishmen paid to wage war against Portugal. Less than half of the ship's crew wereBrazilian sailors. To make things worst, they  were at most untrained seamen since the work aboard ships and ports was prohibited to those who were not a Portuguese native when Brazil was not a free country. 
Although the performance of the ships during the war of independence was far from suitable,  it was sufficient to guarantee the defense of the coast, depriving the enemy troops on land of  supplies coming from the metropolis, forcing,  this way, the withdrawal of Portuguese forces. When the fight against the Portugal was over in 1823,  the conflict against Provincias  Unidas do Prata emerged. The Imperial Navy played a importand roll in blocking Buenos Aires seaports. In 1852 the navy was once again called to intervene in the southerners conflicts when a revolt against Buenos Aires was raised in the  Argentinean provinces.
During the Triple Alliance War (1864-1870) the Imperial Navy played a series of activities, being responsible for the control of the rivers and for the passage of the Humaita Fortress.
Despite many problems, the navy gained much recognition for its support both in internal and external conflicts. By 1880 the Imperial Navy was the greatest naval force of Latin America and the sixth of the world.
When  Republic was proclaimed in 1889, the army became a main political force, while the navy was put aside, losing its previous status.
The  Commanders
First units The Conflicts
Cisplatine War
Lord Cochrane
Ship of Line Pedro I
Frigate Piranga
Campaign against Rosas
Joaquim Marques Lisboa
Frigate Niteroi
Sloop Liberal
The Triple Alliance War
Gallery
Sloop  Maria da Gloria
Curupaity
Naval Battle of Riachuelo
The Armoured Ship Brasil
Armoured Cruiser Tamandare
To South American Military History
Monitor Alagoas