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The Cayenne Battery (formally, Historical Cayenne Battery - Portuguese: Bateria Histórica Caiena) of the Brazilian Army is one of three military units that comprise the Brazilian president's honor guard, the others being the 1st Guards Cavalry Regiment (Portuguese: 1º Regimento de Cavalaria de Guardas - RCG) - "Independence Dragoons" and the Presidential Guard Battalion (Portuguese: Batalhão da Guarda Presidencial - BGP).
"Cayenne Battery" was how the Brazilian colonial troops, sent by John VI to conquer French Guiana in 1809, were known. Nowadays, it is part of 32nd Artillery Campaign Group, but falls within the 1st Guards Cavalry Regiment due to the necessity of horses. It uses horse-drawn cannons and is responsible for 21-gun salutes at special ceremonies.
In 1808, Portugal's Royal Family had sought refuge in Brazil during the Napoleonic wars. On June 10, 1808, Dom João VI declared war on France and sent 470 soldiers to French Guiana to bring support to the Royal Navy.
In 1815, Brazil's status was elevated to The United Kingdom of Portugal, Brazil and the Algarves. The Portuguese troops in Brazil, some of which had already been previously stationed there, all united under the direct command of the Brazilian Ministry of War, and thus in honor of the victory in the Cayenne, the artillery battery which was deployed there was officially renamed as the Cayenne Battery.
- "Bateria Histórica Caiena". Presidência da República. Archived from the original on 14 March 2008.
On June 10, 1808, King John VI declared war on France and immediately ordered the occupation of French Guiana. A battery of 470 Brazilian soldiers, under the command of Lieutenant Colonel Manuel Marques d'Elvas Portugal, invaded the territory with the support of a squadron of the British Navy. (In Portuguese)