Ten-Day War happened on 1991-06-27.
Anastasian War happened in 502.
Caucasian War happened in 1817.
Cretan War happened in -205.
Castellammarese War happened in 1930.
Contestado War happened in 1912.
it's a week 1 ten day = 1 week 5 ten days = 5 weeks (etc.) According to the Forgotten Realms Wiki a tenday is actually ten days long. "...divides the thirty day months into three blocks of ten days each, or simply put a tenday" It can normally be used with the Earth term 'week'. See the related link for more information.
As of August 2014, there is not another Civil war about to happen in the US.
World War 2
the war happen in 1955 to 1975
the creek war happened in 1865
Kieft's War happened in 1645.
Rif War happened in 1923.
Black War happened in 1828.
Gosannen War happened in 1083.
Dunes of War happened in 2007.
Pyrrhic War happened in -280.
Smolensk War happened in 1632.