攻

Right action radical — the indexing radical, the 4-stroke abbreviated form of 攴, depicting a hand holding a stick. Marks 攻 as active intervention with force. Compound logic: work + strike = sustained attack. Same radical drives 救 rescue, 改 change, 教 teach — all 'getting it done by hand-action.'

Left side 工 supplies the sound exactly: gōng. The 'work, labor' meaning of 工 also adds a faint semantic resonance — attacking is sustained effort. Same phonetic frame in 功 merit and 红 red. The simplest possible left half: just a carpenter's square or a leveling tool.