noun
land war; ground combat
Refers to military operations conducted on land, as opposed to air or naval warfare. Often used in historical or strategic contexts.
第二次世界大戦では、ヨーロッパ各地で激しい地上戦が行われた。
During World War II, fierce land battles were fought across Europe.
海上戦 means 'naval warfare' or 'sea battle', contrasting with 地上戦 which is land-based.
Compound of 地上 (chijō, 'on the ground') + 戦 (sen, 'war' or 'battle').