battle array; battle formation; battlefield
Refers to the arrangement of troops for battle, or the battlefield itself. Often used in historical or military contexts.
They formed a battle array and awaited the enemy.
戦陣に臨む兵士たちの表情は厳しかった。
The soldiers facing the battlefield had stern expressions.
Compound of 戦 (war, battle) and 陣 (camp, battle formation). The exact historical derivation is uncertain, but the spelling is conventionally associated with military formations and battlefields.