These Spearheaders gained their name to make them seem more professional, but their real purpose is to only lure the enemy away.
ruse - (ro͞oz,ro͞os) noun. an action intended to deceive someone; a trick.
feint - (fānt) noun. 1. a deceptive or pretended blow, thrust, or other movement, especially in boxing or fencing.
"a brief feint at the opponent's face"
verb. 1. make a deceptive or distracting movement, typically during a fight.
"Adam feinted with his right and then swung a left"
A sacrificial lamb is a metaphorical reference to a person or animal sacrificed (killed or discounted in some way) for the common good. The term is derived from the traditions of Abrahamic religion where a lamb is a highly valued possession.