Task: Question Answering
Input (English): Passage: The Natchez revolt, or the Natchez Massacre, was an attack by the Natchez people on French colonists near present-day Natchez, Mississippi, on November 29, 1729. The Natchez and French had lived alongside each other in the Louisiana colony for more than a decade prior to the incident, mostly conducting peaceful trade and occasionally intermarrying. After a period of deteriorating relations, however, Natchez leaders were provoked to revolt when the French colonial commandant, Sieur de Chépart, demanded land from a Natchez village for his own plantation near Fort Rosalie. They plotted their attack over several days and managed to conceal their plans from most of the French; those who overheard and warned Chépart of an attack were considered untruthful and were punished. In a coordinated attack on the fort and the homesteads, the Natchez killed almost all of the Frenchmen, while sparing most of the women and African slaves. Approximately 230 colonists were killed overall, and the fort and homes were burned to the ground.
When the French in New Orleans, the colonial capital, heard the news of the massacre, they feared a general Indian uprising and were concerned that the Natchez might have conspired with other tribes. They first responded by ordering a massacre of the Chaouacha people, who had no relation to the Natchez revolt, wiping out their entire village. The French and their Choctaw allies then retaliated against the Natchez villages, capturing hundreds of Natchez and selling them into slavery, although many managed to escape to the north and take refuge among the Chickasaw people. The Natchez waged low-intensity warfare against the French over the following years, but retaliatory expeditions against Natchez refugees among the Chickasaw in 1730 and 1731 forced them to move on and live as refugees among the Creek and Cherokee tribes. By 1736 the Natchez had ceased to exist as an independent people.
The attack on Fort Rosalie destroyed some of the Louisiana colony's most productive farms and endangered shipments of food and trade goods on the Mississippi River. As a result, the French state returned control of Louisiana from the French West India Company to the crown in 1731, as the company had been having trouble running the colony. Louisiana governor Étienne Périer was held responsible for the massacre and its aftermath, and he was recalled to France in 1732. 
Question: Who plotted their attack over several days and managed to conceal their plans from most of the French?
Output (English): Natchez leaders.