He undoubtedly recalled the debacle at Chancellorsville, where the high ground ("Hazel Grove") he was forced to give up was used against him as a deadly Confederate artillery platform.
Han huskede utvivlsomt det totale sammenbrud ved Chancellorsville, hvor det højereliggende område "Hazel Grove", som han blev tvunget til at opgive, viste sig at blive en dødsensfarlig platform for artilleri mod ham.