The Great Drowning of 1856 was a campaign by the Marquetien military to move into the Princedom of Milena and exterminate the 400,000 Christians living in three cities along the Saint Francis River. King Leali Faustino delivered the orders for the campaign and oversaw it personally.
On May 17, 1856, several thousand troops in the Marquetien military moved on the cities of Cristela, Solomno, and Maranta with lightning speed. The roads in and out of the cities were blocked, and the next week saw the systematic drowning of the entirety of the cities' populations. The genocide is named such as the method preferred by the military was destructing homes in the towns brick by brick and subsequently attaching them to victims' feet.
So many bodies flowed down the Saint Francis River that it threatened to completely dam the river, and reports of bodies clogging sewage drains or washing up in the city of Fuerteventura would continue for years. Skeletons from the incident can still be found in parts of the river.
Today, the location of the genocide serves as a nuclear waste storage facility.