I've been reading Gen. Erasmus Keyes' 50 years Observations of Men and Events (1885). Keyes was for many years, starting in 1832, Scott's Aide de Camp, and he has a great deal of interesting personal recollections of the old man who was his hero -- though he was quite frank about Scott's shortcomings as well. He also knew, prewar, many of the Civil War's "big names" on both sides, and his 'observations' are often enlightening.
After reading John S. D. Eisenhower's bio of Scott, I find it sad that how he seems to be remembered at times is as a distressed-looking fat old man. The descriptions of him leading assaults up cliffs in the War of 1812 are wholly forgotten.