Paul, I thought an underlying point in your examples was clear; Leadership abounds in many people it just takes a moment of challenge to test us towards employing either the natural talents or the learned skills. While many of your examples are historical acts of heroism,  we can assume those events and the leaders championing them demonstrated great leadership during other smaller events. Simply because we are aware of the large events could indicate that these heroic leaders regularly demonstrated the finest qualities of leadership for without their solid base of empathy,  servanthood, self awareness and courage their heroic acts would, could not have happened. Thank you for a richly filled unique answer to the age-old question.
Jesse