The Lakota reservoir at Lost Soldier Field was discovered in 1922. The Lakota produced about 5 MMBO between 1922 and the early 1950's, when the reservoir was abandoned. Since 1979 32 wells have been completed or recompleted in the Lakota formation. These wells should produce about 1 MMBO. The rediscovery of the Lakota reservoir at Lost Soldier Field points out a wide opportunity--to reenter abandoned reservoirs and develop overlooked reserves.