If someone spearheads a campaign or an attack, they lead it.
例句
...Esther Rantzen, who is spearheading a national campaign against bullying...埃丝特·兰森，一场全国性的反抗暴力运动的领导者Helicopters can to some extent take the place of tanks by spearheading the airborne attack.直升机可以担任空中进攻的前锋，从而在某种程度上取代坦克的地位。
N-COUNT
前锋;先头部队
The spearhead of a campaign is the person or group that leads it.
例句
The marines went ashore as a spearhead this morning to capture key targets.今天早晨，海军陆战队作为先头部队率先登陆以占领主要目标。
英汉词典释义
n.
先锋, 先头部队
American troops formed the spearhead of the attack.美军是这次进攻的先头部队。
vt.
当…的先锋, 带头
He is spearheading the peace movement.他充当这次和平运动的先锋。
英英词典释义
Noun
1. someone who leads or initiates an activity (attack or campaign etc.)
2. the leading military unit in an attack
3. the head and sharpened point of a spear
Verb
1. be the leader of;
"She spearheded the effort to find a cure for the disease"