On 13 January, the Revolutionary Democratic Front (FDR) called for Salvadorans to go on a general strike to support the FMLN's offensive in "FMLN General Order Number 2". The FMLN also stated that it would assassinate Duarte. Duarte called on Salvadorans to ignore the FMLN and continue to work, promising that the army would protect them. Around 20,000 Salvadorans from twenty-six factories went on strike, leading to several business closures. FMLN soldiers were optimistic and believed the offensive would succeed as their numbers were similar to those wielded by the Sandinista National Liberation Front (FSLN) in Nicaragua when Anastasio Somoza Debayle was overthrown in 1979. Reinforcements arrived to support the 3rd Infantry Brigade's defense of San Francisco Gotera and the air force airlifted reinforcements and supplies and retrieve wounded to and from several isolated pockets in northern El Salvador. The FMLN attempted to capture the Cerrón Grande Hydroelectric Dam in Chalatenango and Cabañas which generated power for the nation by forming the Cerrón Grande Reservoir from the Lempa River. Mena Sandoval ended his mutiny and returned to the 2nd Infantry Brigade, revealing that the FMLN was expecting the arrival of 800 soldiers from Nicaragua. The Honduran Navy assisted the Salvadoran Navy in sending reports about rebel and Nicaraguan activities in the Gulf of Fonseca.