Imperial forces In order to fulfill the objective of taking the town, the Imperial Navy sent a division under the command of the English frigate captain James Shepherd. This force consisted of the following vessels: • The corvette
Duqueza de Goyas, commanded by Shepherd. • The corvette
Itaparica, commanded by William Eyre. • The brig
Escudeiro, commanded by Luis Pouthier. • The schooner
Constança, under the command of
Joaquim Marques Lisboa. The force consisted of slightly more than 650 men, 200 of whom were non-Brazilian.
Argentine forces Since Carmen de Patagones was too far from the main theater of operations, there were not enough troops available to defend the main square. The fort's commander, Martín Lacarra, had a hundred infantrymen, and managed to recruit about 80 men on horseback, mostly
gauchos, plus the corsairs and an artillery picket from one of the ships under repair, the
Chacabuco. This was later joined by a group of black volunteers and a squad of neighbors. In addition, the inhabitants of Patagones, the majority of which were women, were provided with sticks, hats and militia clothes, trying to simulate a column in the rear. This "rearguard" occupied visible positions in the fort, pretending that the Argentine forces would resist in that place, without going out to fight. This contributed in a fundamental way to the surprise effect used by the Argentine troops in the battle, since the spies sent by the Imperials reported this situation to their leaders, who were surprised when they wanted to overcome the small Cerro de la Caballada, named after the horse charge with which the Argentines defeated the invaders. As for the fleet, it was made up of: • The smack
Bella Flor, under the command of Santiago Jorge Bynnon • The brigantine
Oriental Argentino, under the command of the French privateer Pedro Dautant. • The corsair whalers
Hijo de Mayo and
Hijo de Julio, commanded by Englishman James Harris and Frenchman Francisco Fourmantin, respectively. • The schooners
Emperatriz and
Chiquita; these had recently been captured from the Brazilians. In total, the number of men embarked was approximately 330, 250 of which were non-Argentines. == Battle ==