Question: The Battle of San Roque was part of the Argentine Civil War, the Federalist forces of Córdoba Province governor Juan Bautista Bustos were defeated by which forces of General José María Paz, who were the proponents of the concept of a unitary state (centralized government) in Buenos Aires during the civil wars? 

Context paragraphs:
Battle of Angaco: The Battle of Angaco (16 August 1841), was a clash in the Argentine Civil Wars between Unitarian and Federalist forces at Angaco, about 23 km NNE of San Juan, Argentina, that gave an ephemeral advantage to the Unitarians.

Decembrist revolution (Argentina): The Decembrist revolution (Spanish: "Revolución decembrina" ) was a military coup in the Buenos Aires Province, Argentina.  Juan Lavalle, returning with the troops that fought in the Argentine-Brazilian War, made a coup on December 1, 1828, deposed the governor Manuel Dorrego and closed the legislature.  Dorrego was captured and executed a short time afterwards.  The rancher Juan Manuel de Rosas organized militias that fought against Lavalle and removed him from power, restoring the legislature.  However, as the coup had reignited the Argentine Civil Wars, Rosas was appointed governor of the Buenos Aires province to wage the war against the Unitarian League.  José María Paz made from Córdoba a league of provinces, and so did Rosas.  The conflict ended a short time after the unexpected capture of Paz, who mistook enemy troops for his own.

Unitarian Party: Unitarianists or Unitarians (in Spanish, "Unitarios") were the proponents of the concept of a unitary state (centralized government) in Buenos Aires during the civil wars which shortly followed the Declaration of Independence of Argentina in 1816.  They were opposed to the Argentine Federalists, who wanted a federation of independent provinces.  (Argentine Unitarianism was an ideologic grouping, not a religious one, and it is unrelated to religious Unitarianism.)

José María Paz: Brigadier General José María Paz y Haedo (September 9, 1791 – October 22, 1854) was an Argentine military figure, notable in the Argentine War of Independence and the Argentine Civil War.

Battle of Laguna Limpia: The Battle of Laguna Limpia, was part of the Argentine Civil Wars.  It happened in the southwest of the Corrientes Province, Argentina on 4 February 1846, when the army under Entre Ríos Province governor Justo José de Urquiza, defeated and captured the commander of the vadvanced columns of Corrientes' army, Juan Madariaga.

Battle of Caaguazú: The Battle of Caaguazú took place in Mercedes Department, in Corrientes Province, Argentina on 28 November 1841, during the Argentine Civil War, between the forces of Entre Ríos Province, commanded by brigadier Pascual Echagüe and Corrientes Province, under brigadier José María Paz, with a sound defeat of the Federal Party forces of Entre Ríos.

French blockade of the Río de la Plata: The French blockade of the Río de la Plata was a two-year-long naval blockade imposed by France on the Argentine Confederation ruled by Juan Manuel de Rosas.  It closed Buenos Aires to naval commerce.  It was imposed in 1838 to support the Peru–Bolivian Confederation in the War of the Confederation, but continued after the end of the war.  France didn't land ground forces, but instead took advantage of the Uruguayan Civil War and the Argentine Civil Wars, supporting Fructuoso Rivera and Juan Lavalle against Manuel Oribe and Rosas.

Battle of Rincón de Valladares: The Battle of Rincón de Valladares (6 July 1827) was a battle during the Argentine Civil Wars.  It was fought between Federalist forces led by Facundo Quiroga and Unitarian forces under Governor Gregorio Aráoz de Lamadrid, near the city of San Miguel de Tucumán.

Battle of San Roque: The Battle of San Roque was part of the Argentine Civil War.  It was fought on the Primero River, near the city of Córdoba, Argentina, on 22 April 1829.  The Federalist forces of Córdoba Province governor Juan Bautista Bustos were defeated by the Unitarian forces of General José María Paz.  As a result of his victory, Paz assumed the office of provincial Governor.

José Miguel Carrera: José Miguel Carrera Verdugo (October 15, 1785 – September 4, 1821) was a Chilean general, member of the prominent Carrera family, and considered one of the founders of independent Chile.  Carrera was the most important leader of the Chilean War of Independence during the period of the Patria Vieja ("Old Republic").  After the Spanish Reconquista ("Reconquest"), he continued campaigning from exile.  His opposition to the leaders of independent Argentina and Chile San Martin and O'Higgins respectively made him to live in exile in Montevideo.  From Montevideo Carrera traveled to Argentina where he joined the struggle against the unitarians.  Carreras small army was eventually left isolated in the Province of Buenos Aires from the other federalist forces.  In this difficult situation Carrera decided to cross to native-controlled lands all the way to Chile to once for all overthrow Chilean Supreme Director O'Higgins.  His passage to Chile, which was his ultimate goal, was opposed by Argentine politicians and he engaged together with indigenous tribes, among the Ranquels, in a campaign against the southern provinces of Argentina.  After the downfall of Carreras ally, the Republic of Entre Ríos, and several victories against the United Provinces of the Río de la Plata Carrera's men were finally defeated by numerically superior forces near Mendoza.  Carrera was then betrayed by one of his Argentine helpers, leading to his capture and execution in that city.  José Miguel Carrera was of Basque descent.

Supporting paragraphs: Battle of San Roque Unitarian Party
Answer: Unitarian