Johnson took office after Robert E. Lee's surrender at Appomatox Court House, but Confederate armies remained in the field. On April 21, 1865, Johnson, with the unanimous backing of his cabinet, ordered General Ulysses S. Grant to overturn an armistice concluded between Union General William T. Sherman and Confederate General Joseph E. Johnston. The armistice had included political conditions such as the recognition of existing Confederate state governments. On May 2, Johnson issued a proclamation offering $100,000 for the capture of Confederate President Jefferson Davis, who many thought had been involved in the assassination of Lincoln. Davis was captured on May 10. In late May, the final Confederate force in the field surrendered, and Johnson presided over a triumphant military parade in Washington, D.C. alongside the cabinet and the nation's top generals. After less than two months in office, Johnson had cultivated the reputation of someone who would be tough on the defeated Confederacy, and his esteem among congressional Republicans remained high.