The Tercio

In a depiction of the Battle of Rocroi on 19 May 1643, a Spanish shot-and-pike formation, called a "tercio", has its arquebusiers fire on oncoming French cavalry, before retreating behind the pikemen who form a wall of spears to block their advance. The French bring up a pike formation of their own, and the dreaded "push of pike" begins.

Example of:
A Thicket of Spears