. . "Full Confederate retreat fromNew Mexico Territorycompleted by early 1862." . . . . "~222 missing or captured" . "Union victory" . "~166 killed," . . . "~246 wounded," . "The New Mexico Campaign was a military operation of the American Civil War from February to April 1862 in which Confederate Brigadier General Henry Hopkins Sibley invaded the northern New Mexico Territory in an attempt to gain control of the Southwest, including the gold fields of Colorado and the ports of California. Historians regard this campaign as the most ambitious Confederate attempt to establish control of the American West and to open an additional theater in the war."@en . "5,142" . "2,515" . "New Mexico Campaign"@en . "United States of America" . "Full Confederate retreat fromArizona Territorycompleted by mid-1863." .