Swiss Guards (; ) are the Swiss
soldiers who have served as guards at foreign European courts since the late 15th century. In addition to small household and palace units, Swiss
mercenary regiments have served as regular line troops in various armies; notably those of
France,
Spain and
Naples (see
Swiss mercenaries). The Swiss were famous mercenaries for hundreds of years. Since Switzerland was a poor country, young men often sought their fortunes abroad. Swiss troops had a reputation for discipline and loyalty, and for employing revolutionary battle tactics such as the
pike square. They were considered the most effective mercenaries of the 15th century, until their battle-drill was improved upon by the German
Landsknechte. At the
Battle of Marignano (1515), the Landsknecht in French service defeated the Swiss pikemen.