located the main body on a plain to the north and brought it into action. Skirmishing continued, but after dark the Villistas retreated and the Americans moved into Tomochic. The 7th Cavalry lost two men killed and four wounded, while Dodd reported his men had killed at least thirty Villistas. Patrol district actions The five districts that Pershing established west of the Mexican Central Railway on April 29, 1916, were: Namiquipa District (10th Cavalry) south of the 30th parallel to Namiquipa; Bustillos District (13th Cavalry), below the eastern part of Namiquipa District around Laguna Bustillos to San Antonio de Los Arenales and Chihuahua City; Guerrero District (7th Cavalry), below the western part of Namiquipa District and west of the Bustillos and San Borja Districts; San Borja District (11th Cavalry), south of Bustillos District between the Guerrero and Satevó Districts to Parral; and Satevó District (5th Cavalry), southeast of the Bustillos District and east of the San Borja District, south to Jimenez. The next significant engagement took place on May 5. A small Carrancista garrison at the silver mining town of Cusihuiriachic was attacked by Villa's forces on May 4, prompting the garrison commander to request help from U.S. forces at nearby San Antonio. Six troops of the 11th Cavalry, its machine gun platoon, and a detachment of Apache Scouts under 1st Lt. James A. Shannon, totaling 14 officers and 319 men, began a night march under Major Robert L. Howze. Arriving at Cusihuirischic, Howze found that 140 Villistas under Julio Acosta had pulled back into the mountains to the west to a ranch at Ojos Azules, and that the garrison commander had received orders not to cooperate with the Americans. Howze was delayed three hours in finding a guide and by the time he located the ranch and was deploying to attack, day had broken. When Acosta's guards and Howze's advance guard exchanged fire, Howze with Troop A immediately ordered a charge with pistols through the hacienda. Unable to deploy on line, the charge was made in column of fours and closed with the fleeing elements of Villistas. The other troops deployed to either side of the hacienda attempting to block escape and were supported by plunging fire from the machine gun troop. Friedrich Katz called the action the "greatest victory that the Punitive Expedition would achieve." Without a single casualty, the Americans killed forty-four Villistas and wounded many more.