Battle of 4 May

The Battle of 4 May was fought in open sea near Salvador, Bahia, on 4 May 1823, between the Brazilian Navy, under the command of a former admiral of the British Royal Navy, Thomas Cochrane, and the Portuguese Navy during the Brazilian War of Independence.

Order of battle
Along the way, other vessels joined the fleet. On April 30, the Portuguese realized the Brazilian fleet and prepared. On May 4, 1823, shortly after sunrise, the Brazilian squadron fell on the Portuguese fleet formed in two columns, to compensate for numerical inferiority of 7 Brazilian ships against 13 Portuguese ships, Cochrane decides to cut the enemy's line by placing the ship-flagship Pedro I plow between Portuguese Princess Royal and the frigate Constitution thus involving the rear enemy before they could maneuver the forefront to help her with this numerical inferiority was compensated.

The fight began at noon, minutes after the Portuguese line was cut, when Peter I, a ship of the line, stood in front of the plow Princess Royal, the ammo just because two Portuguese who delayed the delivery of cartridges, with that Brazilians ran the risk of being caught by forefront Portuguese Cochrane then orders a retreat, leaving the battle without a winner. He settles in Morro São Paulo where plans and meets the block, so Wood Melo decides to leave the capital on the morning of July 2, 1823, he and the Portuguese soldiers embark, but Cochrane perceives and pursues it to Portugal, managing to capture 7 ships during the chase. Salvador was taken by Brazilian troops joining the Empire of Brazil.

Brazil
Names of the ships involved followed by the amount of cannons that ship had (when the amount is known):
 * Pedro I 64 (flag, captain Crosbie)
 * Maria da Glória (Beaurepaire)
 * Piranga (Jowett)
 * Liberal (Garcão)
 * Guarani
 * Real
 * Nitheroy (Taylor)

Portugal
Names of the ships involved followed by the amount of cannons that ship had (when the amount is known):
 * Dom João 74
 * Constituição 50
 * Pérola 44
 * Princesa Real 28
 * Calypso 22
 * Regeneração 26
 * Activa 22
 * Doze de Fevereiro 26
 * Audaz 20
 * São Gualter 20
 * Príncipe do Brazil 26
 * Restauração 26
 * Conceição 8