The project dated back earlier than General Gillmore's siege, and had originally no connection with that movement. It had been formed by Captain Trowbridge and myself in camp, and was based on facts learned from the men. General Saxton and Colonel W. W. H. Davis, the successive post-commanders, had both favored it. It had been also approved by General Hunter, before his sudden removal, though he regarded the bridge as a secondary affair, because there was another railway communication between the two cities. But as my main object was to obtain permission to go, I tried to make the most of all results which might follow, while it was very clear that the raid would harass and confuse the enemy, and be the means of bringing away many of the slaves. General Hunter had, therefore, accepted the project mainly as a stroke for freedom and black recruits; and General Gillmore, because anything that looked toward action found favor in his eyes, and because it would be convenient to him at that time to effect a diversion, if nothing more. It must be remembered, that, after the first capture of Port Royal, the outlying plantations along the whole Southern coast were abandoned, and the slaves withdrawn into the interior. It was necessary to ascend some river for thirty miles in order to reach the black population at all. This ascent could only be made by night, as it was a slow process, and the smoke of a steamboat could be seen for a great distance. The streams were usually shallow, winding, and muddy, and the difficulties of navigation were such as to require a full moon and a flood tide. It was really no easy matter to bring everything to bear; especially as every projected raid must be kept a secret so far as possible. However, we were now somewhat familiar with such undertakings, half military, half naval, and the thing to be done on the Edisto was precisely what we had proved to be practicable on the St. Mary's and the St. John's,--to drop anchor before the enemy's door some morning at daybreak, without his having dreamed of our approach.