Vicksburg, and in the later part of the war he was headquartered at New Orleans for nearly two years and would receive a brevet to Lieutenant Colonel from President Andrew Johnson late in 1865, for his meritorious services in the Gulf Campaign. In January 1866 he was honorably discharged. Nebraska After mustering out of the Army in 1866, Chase moved to Omaha, in the Nebraska Territory, and resumed his law practice. He also became an investor in the incorporation of the Omaha Street Railway Co. In 1867, Nebraska would be admitted to the Union as the 37th state, and in the state's first general election, Chase was elected to a two-year term as the first Attorney General of Nebraska. In 1869, he was appointed to a six-year term as regent of the State University of Nebraska, by Governor David Butler. Chase was elected Mayor of Omaha in 1874, after losing an earlier attempt. He was re-elected in 1875 to a two-year term—this was the first term after Omaha's mayoralty was changed by statute from a one-year term to a two-year term. He was elected to two additional two-year terms in 1879 and 1883, but was impeached and removed from office in June 1884, due to drunkenness impairing his abilities. His wife Mary died to cancer in 1882 and many think this may have contributed to his ill health. Chase later launched quo warranto proceedings in 1887 stating that he had been illegally removed from office, and was unlawfully deprived of the salary of the mayor. The jury rendered a verdict in his favor which gave him some measure of closure. During his terms as Mayor it was recorded of him as having "favoured extensive public improvements" such as parks and boulevards, and direct and gravitational powered waterworks. As mayor, Colonel Chase received and officially entertained a large number of distinguished people—Kalākaua, King of Hawai'i; Peter II, Emperor of Brazil; the Governor General of Canada; U.S. President and Mrs. Rutherford B. Hayes; President and Mrs. Ulysses S. Grant; Generals William Tecumseh Sherman, Philip Sheridan, George Armstrong Custer, and others. In 1871, he was elected Grand Senior Warden in the Nebraska Commandary of Knights Templar. In 1886, he was unanimously chosen president of the Nebraska State Humane Society. Champion Chase was identified as being past commander of the U.S. Grant Post of the Grand Army of the Republic and the Sons of