Passage: Many historians attribute some of the Confederacy's weaknesses to the poor leadership of Davis. His preoccupation with detail, reluctance to delegate responsibility, lack of popular appeal, feuds with powerful state governors and generals, favoritism toward old friends, inability to get along with people who disagreed with him, neglect of civil matters in favor of military ones, and resistance to public opinion all worked against him. Historians agree he was a much less effective war leader than his Union counterpart, President Abraham Lincoln. After Davis was captured in 1865, he was accused of treason and imprisoned at Fort Monroe in Hampton, Virginia.  He was never tried and was released after two years. While not disgraced, Davis had been displaced in ex-Confederate affection after the war by his leading general, Robert E. Lee. Davis wrote a memoir entitled The Rise and Fall of the Confederate Government, which he completed in 1881. By the late 1880s, he began to encourage reconciliation, telling Southerners to be loyal to the Union. Ex-Confederates came to appreciate his role in the war, seeing him as a Southern patriot. He became a hero of the Lost Cause of the Confederacy in the post-Reconstruction South.

Question: what did robert e. lee tell the southerners?
be loyal to the Union