Filibuster War
| Filibuster War | |||||||
|---|---|---|---|---|---|---|---|
| Costa Rican troops attacking William Walker at Rivas in 1856 | |||||||
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| Belligerents | |||||||
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 | Allied Central American Army (Ejército Aliado Centroamericano) 
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| Commanders and leaders | |||||||
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| Strength | |||||||
| 5,213 mercenaries (1855–1857) | 2,500 men (Costa Rica) 4,000 men (Ejército Aliado Centroamericano) | ||||||
| Casualties and losses | |||||||
| 1,000 killed | 1,202 killed9,615 soldiers and civilians dead by cholera outbreak | ||||||
| History of Nicaragua | 
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The Filibuster War, otherwise referred to as the Walker affair, or The National Campaign of 1856 and 1857 in Costa Rica, was a military conflict between filibustering multinational troops stationed in Nicaragua and a coalition of Central American armies. An American mercenary, William Walker, and his small private army were invited to Nicaragua in 1855. He seized control of the country by 1856, but was ousted the following year.