Grant would state that he chose to face the larger force at Donelson because he knew the commanders from the Mexican War (Pillow & Buckner) stating that "Knowledge of that kind goes far toward determining a move like this." I think the terms were largely tactical as he had the enemy in a position that he felt he could force unconditional surrender. General Smith is quoted as responding to Grant when asked what terms to offer, depending on the source, either "No terms to the damned rebels!" or "I'll have no terms with Rebels with guns in their hands, my terms are unconditional and immediate surrender." Grant wrote down the now famous "Unconditional Surrender" response to Buckner and General Smith approved. Grant was prepared to "move immediately upon your works" because he was aware the garrison was escaping. I do not think the terms were motivated in any form by a concern for appearances, if this were so Grant could have forced the Confederates to participate in a humiliating surrender ceremony which he did not do. I think if anything Grant's terms were a reflection of how he saw the enemy as rebels against the government and not a recognized military force of a sovereign nation. By not having the surrender ceremony he conveyed a similar message that he would not unnecessarily humiliate those rebellious Americans.