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This battle took place on 14, 16 and 17 May, 1814, during the Argentine War of Independence between an Argentine fleet under William Brown and a Spanish fleet under Admiral Sienna off the coast of Montevideo, in today's Uruguay.
Outcome: 5 Spanish ships were burned and 2 were captured on May 17. The other surrendered later and 500 prisoners were taken. Argentine forces lost 4 men killed in action and 1 ship. William Brown was given the rank of Admiral because of this victory.
'Ships involved:'

Contents

Argentina (William Brown)

Spain (Sienna)

Argentina (William Brown)

''Hercules'' 32

''Zephyr'' 18 (King)

''Nancy'' 10 (Leech)

''Julietta'' 7 (McDougald)

''Belfast'' 18 (Oliver Russell)

''Agreeable'' 16 (Lemare)

''Trinidad'' 12 (Wack)

Spain (Sienna)

''Hyena'' 18 (flag)

''Mercurio'' 32

''Neptuno'' 28 - Captured by ''Belfast'' 16 May

''Mercedes'' 20

''Palomo'' 18 - Captured 16 May

''San Jose'' 16 - Captured 16 May

''Cisne'' 12

6 schooners

Source (in Spanish):
[1]