noun
Sekigahara (battle site, 1600)
Refers specifically to the historical location and the famous Battle of Sekigahara in 1600, a turning point in Japanese history.
関ヶ原の戦いは1600年に起こった。
The Battle of Sekigahara took place in 1600.
noun
decisive battle; critical battle
Figurative use derived from the historical battle; refers to any crucial, make-or-break confrontation or contest.
The next match is the decisive battle for the championship.