Action of 27–28 April 1826

Action of 27–28 April 1826
	Part of the Cisplatine War
	; Abordagem da Fragata Imperatriz, by Edoardo De Martino, 1875
Date	27 – 28 April 1826
Location	Off Montevideo, Cisplatina, Empire of Brazil
Result	Indecisive
Belligerents
Empire of Brazil	United Provinces
Commanders and leaders
Luís B. Pereira †	William Brown; Tomás Espora; Leonardo Rosales;
Strength
1 frigate; Total guns: 52	1 corvette; 3 brigs; 3 schooners; Total guns: 90
Casualties and losses
3 dead; 10 wounded; 1 frigate damaged	3 dead; 3 wounded; 1 brig damaged

The action of 27 – 28 April 1826, also known as the Attack on the frigate Imperatriz was an Argentine naval operation off Montevideo against the 52-gun Brazilian frigate Imperatriz, during the Cisplatine War. An Argentine force attempted to capture or sink it while it was isolated, in a plan similar to what had been implemented weeks earlier against the Nichteroy, but failed to do so.