The siege of Riga was a military operation during the Napoleonic Wars. The siege lasted five months from July – December 1812, during which the left flank of Napoleon's "Great Army" (La Grande Armée) tried to gain a favorable position for an attack on Russian-controlled port city Riga, the capital of the Governorate of Livonia. They failed to cross the Daugava River, and accordingly the siege was not carried out completely.