Trouble brewing over Pine Ridge By DIARMID McGUIRE PINE RIDGE (PNS) - On Thursday, June 26, less than two months after the Stars and Stripes was pulled down for the last time from the roof of the U.S. Embassy in Saigon, t h e United States suffered its first casualties in what may turn out to be America's next colonial war. On that day, two FBI agents died in a burst of rifle fire at a place called Jumping Bull on the Pine Ridge Indian reservation in South Dakota. The Vietnam analogy may be overblown. Native Am e r i c a n peoples were thoroughly sabju- gated in a series of one-sided military confrontations that ended nearly a century ago. But there are indications that the new generation of militant Indians that first surfaced in the 1973 occupation of Wounded Knee is escalating its tactics. More certain is that the poli- tical climate on Pine Ridge has changed markedly since the June 26 shootings. No one yet understands t h e specifics of what hanened last month at Jumping Bull. BOTH SIDES at first attempt- ed to create self-serving v e r- sions of the incident: The I claiming its agents had heen ambushed from "tinkers" and savagely mutilated, tie Ameri- can Indian Movement (ATM) claiming the seenta hal nrovok- ed their own murders by first killing an Indian. Neither version is now accept- ed. All that is known for ctmain is that special agents Jack (ol- er and Ronald Williams were driving to the Jumping Bull compound - a cluster of cab- ins near Aglala Village - to arrest James Theodore Eagle, wanted with three other Ind- ians in an assault chat ge against two white youths. On previous visits to t h e compound, the agents had been informed they were trespassmg and warned not to return with- out warrants. Yet they broght no warrants with them when they went to arrest Eagle. Tne Bur- eau later said a warrant had been issued for the arrest, but that it was not necessary for the agents to actually car y the