In 1863, as raids continued between the Navajo and the New Mexican militia, the New Mexico District Military Governor, General James Henry Carleton, told 18 Navajo chiefs that they must surrender by July 20, 1863, and move to Fort Sumner, at the Bosque Redondo. In July, under orders from Gen. Carleton, Col. Kit Carson began a simultaneous campaign against the Mescelaro Apache and Navajo. In a series of raids and skirmishes Carson's troops began rounding up Navajo and Apache and sending them to Bosque Redondo. Between September 1863 and January 1864, Carson and his men chased the Navajo, killing and capturing a few. Crops were burned, stock was confiscated, hogans were burned. Carson attempted to capture a Navajo stronghold in the Battle of Canyon de Chelly. Although the army missed destroying the entire force, they destroyed much Navajo property.
Question: For how many months did Carson and his men chase, kill, and capture the Navajo?
Answer: 4