The word mercenary refers to a number of different things:
A mercenary is a soldier who fights for money, regardless of ideological, national or political considerations.
Mercenaries: Playground of Destruction, an Xbox and PlayStation 2 video game released in 2005.
Mercenary, a computer game released by Novagen Software Ltd in 1986.
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A mercenary is a soldier who fights, or engages in warfare primarily for private gain, usually with little regard for ideological, national or political considerations.
Swiss mercenaries were sought after during the late 15th and early 16th centuries as being an effective fighting force, until their somewhat rigid battle formations became vulnerable to arquebuses and artillery being developed at about that period.
It was then that the German landsknechts, colorful mercenaries with a redoubtable reputation, took over the Swiss forces' legacy and became the most formidable force of the late 15th and throughout the 16th century, being hired by all the powers in Europe and often fighting at opposite sides.