Press Shift+Enter and enter one of the following codes: 

 Fortify everyone
                      Union: Hooker;
                      Confederacy: Longstreet 
 Eliminate all stress 
                      U: Hancock, C: Jackson 
 Increase experience
                      U: Mcclellan; C: Beauregard
 Reset clock to start
 time 
                      U: Buford; C: Stuart 
 Advance clock to end
 time 
                      U: Sedgewick; C: Pickett
 Bring in all
 reinforcements
 immediately
                      U: Reynolds; C: Hill 
 Computer vs. Computer
 mode 
                      U: Halleck; C: Halleck 
 Rally all routed troops
                      U: Sheridan; C: Lee 
 See all troops
                      U: Warren; C: Hotchkiss 
 See enemy order of
 battle 
                      U: Custer; C: Harrison