Here's something about the Mexican Revolution.
"The Chinese proved apt scholars in this grim art of war and in a month they were ready to fight, as fighting goes in Mexico. So one fine day, when the Villista commisary was running low and there was a scarcity of the"dinero" of the realm they set out on a voyage to levy tribute, loot and kill, [...] the Orientals were elected to take the lead in going against the invaders. The Chinese are not given to wasting anything, not even ammunition. They permitted the Villa contingency, which outnumbered them about six to one, to come within easy range. Then they opened up, and just kept on pumping bullets into the Villistas until two-third of their number had been wiped out. [...] From that day on Pancho Villa has had a price on every Chinamen's head in Mexico."
Excellent fire discipline was displayed here.
Many Chinese in Mexico threw their lot in with General Pershing when he led a punitive expedition against Pancho Villa. They became the cooks, laundrymen and most importantly, the mule skinners who supported Pershing's columns. Knowing that they would be executed by Villa if left behind, he brought them with him when he recrossed the border back into the United States and had them housed on an army base until he could get a special law passed that granted them permanent residency (despite the Chinese Exclusion Act). They became known as Pershing's Chinese.
The Chinese who stayed behind (because they were not participants of Pershing's campaign) were executed, along with their Mexican wives and their children, by Villa and his men. It was genocide south of the border.
From Tang, Irwin A, Asian Texans: Our History and Our Lives, Austin: The It Works, 2007, p 114-115. The Chinese joined los Federales after 300 of their number were massacred in Torreon (May, 1911). The company involved was recruited in Chihuahua City, NW of Torreon. Adapted from "Planting the Celestial Republic in San Antonio," San Antonio Express, June 17, 1917.