partisan

An adherent to a party or faction.

A fervent, sometimes militant, supporter or proponent of a party, cause, faction, person, or idea.

A member of a band of detached light, irregular troops acting behind occupying enemy lines in the ways of harassment or sabotage; a guerrilla fighter.

(historical) A long-handled spear with a triangular, double-edged blade having lateral projections, in some forms also used in boar hunting.

(no longer used) The commander of a body of detached light troops engaged in making forays and harassing an enemy.

(no longer used) A soldier armed with such a weapon.

Adherent to a party or faction; especially, having the character of blind, passionate, or unreasonable adherence to a party.

Devoted to or biased in support of a party, group, or cause.

Serving as commander or member of a body of detached light troops.