ATTEMPTED COUP D'ETAT 1981

23-F was an attempted coup d'état in Spain that began on 23 February 1981 and ended on the following day. It is also known as El Tejerazo from the name of its most visible figure, Antonio Tejero, who led the failed coup's most notable event: the bursting into the Spanish Congress of Deputies by a group of 200 armed officers of the Guardia Civil during the process of electing Leopoldo Calvo Sotelo to be the country's new Prime Minister. King Juan Carlos I gave a nationally televised address denouncing the coup and urging the maintenance of law and the continuance of the democratically elected government. The coup soon collapsed. After holding the Parliament and cabinet hostage for 18 hours the hostage-takers surrendered the next morning without having harmed anyone.

http://en.wikipedia.org/wiki/23-F
http://www.antropologiavisual.net/2006/spanish-contemporany-history-on-tv-the-tejero%E2%80%99s-%E2%80%9Ccoup-d%E2%80%99etat%E2%80%9D-feb-1981/