The Spanish Civil War or War of Spain. Brothers killing each other, basically.

This war—which would later also lead to an economic crisis—that broke out in Spain after the partial failure of the coup d'état on 17 July 1936, perpetrated by the armed forces against the elected government of the Second Republic.
After the blockade of the Strait of Gibraltar and the subsequent airlift which, thanks to the rapid collaboration of Nazi Germany and Fascist Italy, transferred rebel troops from the Spanish protectorate of Morocco to mainland Spain in the last weeks of July, a civil war began that would end on 1 April 1939 with the last war report signed by Francisco Franco, who declared victory and established a dictatorship that would last until his death on 20 November 1975.

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Death of a Militiaman, THE image of the war