Foulois knew that his aircraft could not long withstand the rigors of desert flying, and he devised a plan to conserve the remaining planes. He suggested that a radio-telegraph link be established between Casas Grandes and Namiquipa, and that motorcycles be used for routine message traffic. The planes would be reserved for emergency use. He also requested 10 new planes capable of performing in the adverse conditions of Mexico, but he was informed that all available aircraft were already with the punitive expedition.

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The 1st Aero Squadron did receive more trucks and personnel, however, and by May 1 the squadron boasted 16 officers and 122 enlisted men. Even though Pershing’s forces met and defeated a large force of Villa’s troops at Parral, the fliers played no part in that action. The planes, in fact, had not yet been equipped with any type of offensive weapon larger than a .22-caliber rifle or a .45-caliber pistol, even though machine guns and bombs had been ordered to outfit them. (The squadron had received a shipment of 3-inch artillery shells in April, but none of the aviators knew how to use them as aerial bombs.)

The Signal Corps had previously experimented with bombsights, bomb-release mechanisms and a variety of aerial explosives, but the tests had been abandoned because Brig. Gen. George P. Scriven, the chief signal officer, felt that airplanes should be used solely for reconnaissance. Many years later, Foulois somewhat ruefully noted that ‘using the airplanes as offensive weapons…was contrary, of course, to military policy at the time.’

The squadron moved to San Geronimo on April 5. Just a day later, Kilner’s plane landed too hard, tearing off a wheel. The JN-3 ground looped and was destroyed. The squadron was down to five planes on the eve of its most important and hazardous mission. Early on April 7, 1916, two planes took off and flew from San Geronimo to Chihuahua. One was piloted by Dargue, with Foulois sitting in the observer’s seat. Carberry was at the controls of the other plane, accompanied by Dodd. The two planes flew to Chihuahua City with identical messages for Marion H. Letcher, the American consul in that city. Carberry landed north of Chihuahua and Dodd set off with the message for Letcher, while Dargue landed south of the city.

Foulois exited the plane, then ordered Dargue to fly north and rejoin Carberry. Foulois started into town, but as Dargue’s airplane was climbing, he was fired on by four mounted Mexican policemen armed with Winchester rifles. Foulois heard the shooting (the first recorded attack against an American military plane) and intervened. The Mexicans stopped shooting but trained their weapons on Foulois, who later said of the episode, ‘There was nothing I could do but put my hands up — and pray.’ Surrounded by bystanders shouting ‘kill the gringo,’ Foulois was carted off to jail.

Dargue and his plane were unhurt by the gunfire, and a few minutes later he landed near Carberry’s plane, where an angry crowd of Carranza supporters had gathered. The Mexicans, indignant about the American incursion into their country, began to vandalize the two planes. They burned cigarette holes in the wings, cut the fabric and removed a number of nuts and bolts from the aircraft. In desperation, the two pilots started their engines.

The enraged crowd threw rocks as the aviators lifted off. Carberry managed to fly to an American-owned smelter six miles away, but Dargue’s plane was struck by one of the stones and the stabilizer was damaged. Dargue brought the crippled plane down safely but was immediately surrounded by the hostile crowd.

Meanwhile, even though he had been dragged off to jail, Foulois managed to contact a Colonel Miranda of the Mexican army, who released the airman and escorted him to the military governor of Chihuahua, General Eulallo Gutierrez. Gutierrez ordered his troops to help Foulois find Dargue. When Foulois and his escorts arrived, Dargue was doing his best to hold off the angry mob, armed with no more than his wits and bare hands. Dargue’s plane was repaired later that afternoon, and the somewhat shaken airman flew back to San Geronimo.

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