The original letter has come to light only within the last few years; and upon making a comparison with the _Wau-Bun_ account it is seen that General Hull ordered the evacuation, without leaving anything whatever to the discretion of the officer to whom the order is addressed, though discretionary permission is implied by the conditional clause "if practicable" in the _Wau-Bun_ account. Just how far Captain Heald would have been justified in using his discretion and disregarding the order to evacuate in view of the great danger there was in obeying it, is a question upon which there were opposing views then, and regarding which there has since been much controversy. It is plain, however, that a strict construction of the order would have required that the post be evacuated, no matter how serious the consequences of doing so might be; and judging from what we know of Captain Heald's character, it is not at all strange that he interpreted his orders literally. The difficulties with which Captain Heald was encompassed can be but dimly realized. Far removed, as he was, from the nearest post; surrounded by hordes of savages who, though professing friendship, were without doubt in sympathy with the enemy, he well knew that whatever course he might adopt would endanger the safety of the people under his care. His orders to evacuate were indeed positive; but if he could have been assured of safety by remaining and holding the post, he would have been justified without doubt in doing so; and it was the unanimous opinion of his advisers, including the officers of the garrison, that this should be done. Captain Heald's problem, however, was a military one; he believed in obeying orders, on the theory that his superiors issued them as a part of a comprehensive plan. If he should remain at the post in defiance of his plain instructions he might embarrass a well-planned campaign and invite disaster in a larger field than he could be aware of. Thus, he decided (for though slow in his judgments, he was a man of much decision of character) that the evacuation must be made, and the many appalling risks of a retreat through the wilderness must be hazarded.