Yuma War
The Yuma War was the name given to a series of United States military operations conducted in southern California and what is today southwestern Arizona from 1850 to 1853. The Yumans were the primary opponent of the United States Army, though engagements were fought between the Americans and other native groups in the region. Conflict generally took the form of guerrilla warfare, and, over the course of three years, the army engaged in pursuing unfriendly natives, protecting American settlers crossing the Colorado River and preventing conflict between the native tribes. A peace treaty in summer of 1853 was signed, ending hostilities between the Yuma and the United States, but it sparked a short war between the Yuma and the Cocopah. During the conflict, the historic Fort Yuma was constructed and became an important outpost on the frontier.
Ayutthaya–Lan Na War (1441–1474)
The fighting between Ayutthaya and Lan Na resumed between 1494 and 1530. During this period, Lan Na constantly raided their neighbors to their south while Ayutthaya repeatedly mounted invasions in retaliation. Ramathibodi II became king of Ayutthaya in 1491 and ruled until 1529. He instituted compulsory military service to help fight his wars. The Burmese–Siamese War in 1547–49 was inconclusive. A much more dangerous threat developed when Bayinnaung became king of Burma in 1551. Starting in 1563 Bayinnaung conquered both Lan Na and Ayutthaya. The Burmese were not ejected until the Thai revolt of 1587.