noun
Broadly used for any deliberate plan or approach, from everyday situations to business and games.
次の試合の作戦を練ろう。
Let's work out a strategy for the next match.
彼の作戦は
His plan worked well.
noun
military operation; naval operation
Specifically refers to a planned military or naval operation.
軍は大規模な作戦を開始した。
The military launched a large-scale operation.