No, not at all as strenous!  One reenactor from Ohio held a day job in a meat packing house..always in coolers and cool areas.  I spoke to him after the first day...his eyes glazed and appearing very weak.  The heat got to him totally and he had to take a day off.  And, this was only a reenactor.  The real men and support..woe, woe, woe...terrible times.

One interesting note I learned, the infamous Pickett's Charge of Gettysburg where the Confederates charged across a large field and were amost decimated...seems the fuses for canon the Army of Virginia used were from a new supplier.  The original factory had burned. The new fuses were not timed properly and most Southern shells expoloded beyond the target. That might have made a difference.  The difference might have saved a few lives but not the outecome of the war in all.   

Now, it is zzzzzzzzzztime for TomDart.  Thanks for tuning in, Firesnuffer.