戦せん闘とう前ぜん哨しょう

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Meanings

1

noun

combat outpost

Military term for a forward position used for observation or defense during combat.

war, battle, match

闘fight, war

前in front, before

哨scout, sentinel

前ぜん哨しょう
前哨 alone means 'outpost' or 'skirmish'; 戦闘前哨 specifically emphasizes a combat-oriented outpost.
前ぜん哨しょう戦せん
前哨戦 refers to a preliminary skirmish or engagement, while 戦闘前哨 is the physical outpost itself.

Compound of 戦闘 (combat) and 前哨 (outpost). The exact historical derivation is uncertain, but the term is used in modern military contexts.