He was out in the cold too long not properly dressed and caught Pneumonia.
He died because the Battle of Mammoth was so hot and humid. There was not enough water to keep him hydrated. This is only one of the theories for his death. The other theory was that he got shot...
March 9, 1944.
http://www.essortment.com/all/mollypitcherbi_rotw.htm 1789
tuberculosis