Pikes

A weapon often favoured by mercenary regiments is the pike. Pikes are very long spears, almost twice as once as a longer spear and longer even than a horseman's lance. Because of the great length of the pike, it can reach over three ranks of soldiers (the men behind level their pikes over the shoulders of, or between, the men in front).

When fighting cavalry, pikemen close ranks and form an impenetrable wall of sharp points. Horses are very reluctant to close with this steel hedgehog and are held at bay.

Source
Pica Tileana
 * Warhammer Armies: Dogs of War (5th Edition)
 * pg. 21

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