"Riley's brigade had moved in advance by our right. Leaving the mules and tools, I moved the company forward, falling in with the brigade of General [Persifor] Smith. Captain Lee being present, with his consent, I requested the General to allow the engineer company to fight in his brigade. He told me to take the head of the column, and to direct myself towards a church in a village, on the left of the enemy's battery--between it and the city. Whilst passing down the hill and crossing the ravine, the enemy were rapidly appearing [reinforcements from the direction of the city] on an eminence beyond the church. General Smith directed me to take my company as an escort, reconnoitre the village, and find out whether Colonel Riley's brigade was in the vicinity. I continued some distance beyond the church; and returned without seeing the brigade under Colonel Riley, which had, as I understood afterwards, advanced very near [the rear of] the enemy's battery. The reinforcements of the enemy upon the hill in our front were rapidly increasing. They had at this time probably ten thousand men, on the height, formed in line of battle. Towards dark Colonel Riley's brigade returned and joined the troops under the command of General Smith: too late, however, to allow time for forming the troops to attack the enemy [on the hill] in our front. Lieutenant McClellan joined me about this time in our movement on the village. Lieutenant Foster, who was on horseback, became detached with a few of the men, and did not rejoin me until after the action on the morning of the 20th." "General Smith, very soon after dark, informed me that the enemy's main battery would be stormed, [in rear], at daylight on the morning of the 20th. This would open the road for artillery, and our communications with [the main army under] General Scott would be re-established. I received orders to hold the engineer company ready to move at 3 A. M. and to take my place on the right of the rifles. On the morning of the 20th there was considerable delay in the movement of the brigade [raw troops] under General Cadwallader, by which General Smith's brigade, now under the command of Major Dimmick, First Artillery, was detained very nearly an hour. Part of the Eleventh Regiment [Cadwallader's brigade] lost its way, caused the Voltigeurs to halt, thus throwing the brigade under Major Dimmick still further from Riley's, which had moved very soon after 3 o'clock. At the request of General Cadwallader, Major Dimmick ordered me to turn over the command of my company to the officer next in rank, and to move forward and conduct the troops that had lost their way. The whole force was by sunrise, or little after, halted in a sheltered position in rear of the enemy's battery". (Ex. Doc. No. 1, Appendix p. 67).