Osprey Men-at-Arms №481. Ignacio J.N. López. The Spanish Tercios 1536-1704

Osprey Publishing, 2012. — 50 p. — ISBN: 1849087933.A mixed infantry formation made up of about 3,000 men armed with pikes, swords and handguns, the innovative and influential tercio or 'Spanish square' was the basic combat unit of the armies of Spain throughout much of the 16th and 17th centuries.