This battle took place near Bahia, Brazil, on 4 May 1823 during the Brazilian War of Independence between a Brazilian fleet, commanded by British admiral Cochrane, and a Portuguese fleet. May 4 is the 124th day of the year in the Gregorian calendar (125th in leap years). ... 1823 was a common year starting on Wednesday (see link for calendar). ... Brazilian War of Independence in 1821-1825 was fought between colonial Brazil and Portugal. ...

Ships involved:

Brazil (Cochrane)

Pedro I 64 (flag, captain Crosbie)
Maria da Gloria (Beaurepaire)
Piranga (Jowett)
Liberal (Garcão)
Guarani
Real
Nitheroy (Taylor)

Portugal

Dom João 74
Constitução 50
Perola 44
Princeza Real 28
Calypso 22
Regeneração 26
Activa 22
Doz de Fevereiro 26
Audaz 20
São Gaulter 20
Principe do Brazil 26
Restauração 26
Conceição 8