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.
Vijaya (Champa)
Vijaya was also involved in wars with Angkor (now Cambodia) in the 12th and 13th centuries. Khmer military incursions into Champa were successful for some time and Suryavarman II managed to subdue Vijaya in the 1145, deposing Jaya Indravarman III, but the Khmer were later defeated in 1149. Vijaya was at times dominated by the Khmer king Jayavarman VII. The Khmer king relied on Cham supporters for his successful military campaigns in both Angkor and Champa. Major wars with Vietnam were fought again in the 15th century, which eventually led to the defeat of Vijaya and the demise of Champa in 1471. The citadel of Vijaya was besieged for one month in 1403 when the Vietnamese troops had to withdraw because of a shortage of food. The final attack came in early 1471 after almost 70 years without major military confrontation between Champa and Vietnam. It is interpreted to have been a reaction to Champa asking China for reinforcements to attack Vietnam. Although much of Champa was dissolved after 1471, Vijaya, as well as other principalities, remained as a sort of protectorate within Vietnam.