Throughout August and September he had to deal in the country with dread on the one side of any revolutionary action, and belief on the other side that he was timid and half-hearted. The precise state of his intentions could not with advantage be made public. To up-holders of slavery he wrote plainly, "It may as well be understood once for all that I shall not surrender this game leaving any available card unplayed"; to its most zealous opponents he had to speak in an entirely different strain. While the second battle of Bull Run was impending, Horace Greeley published in the _New York Tribune_ an "open letter" of angry complaint about Lincoln's supposed bias for slavery. Lincoln at once published a reply to his letter. "If there be in it," he said, "any statements or assumptions of fact which I may know to be erroneous, I do not now and here controvert them. If there be perceptible in it an impatient and dictatorial tone, I waive it in deference to an old friend whose heart I have always supposed to be right. My paramount object in this struggle is to save the Union. If I could save the Union without freeing any slaves I would do it; and if I could save it by freeing all the slaves I would do it; and if I could save it by freeing some and leaving others alone, I would also do that. I shall do less whenever I shall believe what I am doing hurts the cause, and I shall do more whenever I shall believe doing more will help the cause. I shall adopt new views so fast as they shall appear to be true views."