[1] It occurred during a period of growing unrest after six years of dictatorship, first under Miguel Primo de Rivera and then under Dámaso Berenguer.

[2] The origins of the revolt can be traced to the Pact of San Sebastián of August 1930, when Republican politicians united with the goal of dethroning King Alfonso XIII of Spain and proclaiming the Second Republic.

Similar arrangements were made with the anarcho-syndicalist Confederación Nacional del Trabajo (CNT: National Confederation of Labour).

From that time he mounted a campaign to get the CRN to support a military uprising at a national level combined with popular demonstrations, but was frustrated by constant postponements of the date.

[3] A significant number of commissioned and non-commissioned officers from different barracks in Jaca participated in the preparations for the revolt, as did some civilians such as Alfonso Rodríguez, Antonio Beltrán, the Palacios brothers and Julián Borderas.

[3] Republican leaders generally stayed away from the events, although some people such as the doctor Nicolás Ferrer, the shoemaker Alagón and industrialists Ruiz and Fontana participated actively.

[3] The CRN representative Santiago Casares Quiroga knew of the decision to delay the uprising and came to Jaca the evening before but did not notify Galán.

[6] Pío Díaz Pradas took charge of the Republican mayor's office to show that the new power would have a strictly civil character.

[1] Delays in requisition of transport by Antonio Beltrán held back the departure from Jaca until 3:00 p.m.[2] The poor weather and excessively slow pace of the advance acted against the insurgents.

[3] Around 5:00 p.m. General Manuel de las Heras with some Civil Guards met Galán's column at the height of Anzánigo(es).

[3] When they reached Ayerbe the insurgents took control of the telephone and telegraph stations, neutralized the Civil Guard and proclaimed the Republic.

[3] At dawn on 13 December 1930 at the heights of Cillas, about 3 kilometres (1.9 mi) from Huesca, the rebels found themselves confronted by the government force.

[2] General strikes were declared in the villages of Mallén, Gallur, Tauste, Ejea de los Caballeros, Farasdués(es), Uncastillo, Sádaba and Sos del Rey Católico.

[8] On 14 December in a short court martial captains Galán and García Hernández were condemned to death, while other officers were sentenced to life imprisonment.

General Gonzalo Queipo de Llano and Major Ramón Franco did capture Cuatro Vientos Airport for a few hours, but when they found that loyalist troops were approaching and no strike had started in Madrid they fled to Portugal.

[9] A reviewer said that a tumult of claps and shouts broke out, and a few timid hisses heated up and inflamed matters, when one of the characters said "if we have no King, we will be better off".

"[6] Popular unrest grew, and Aznar was forced to call municipal elections in April 1931, in which republican candidates won in all major cities and most provincial capitals.

Galán and García Hernández became heroes of the Second Republic, with their portraits displayed in council chambers and the homes of workers throughout Spain.