At about sunset, while many of the regiment were seated on fences watching the passing troops, a Pennsylvania regiment came along the road, halting a few moments for rest in front of our camp. Directly some of our regiment discovered a man in one of the Pennsylvania companies who had been arrested by our regiment as a spy, while we were quartered at the Patent office in Washington. A rush was made for him, he was dragged from his company, and but for the intervention of some of our officers he would have been strung up on the spot. Saturday morning, June 13th, we once more started, our destination being Williamsport, Maryland, distant fourteen miles. This was one of the hardest marches that we made. The weather was hot, the roads rough and dusty, and when we went into camp at Williamsport, there was only one officer and fourteen men of our company with the colors, present. The balance of the company were exhausted, and were straggling along the road, but by sunset they had all arrived in camp. We pitched our tents in the woods and rested the whole of Sunday. Monday morning, June 15th, broke camp at daylight, and started on the road for Harper's Ferry. We had barely got started, when a mounted orderly arrived from Hagerstown, Maryland, with orders for Colonel Burnside to return with his regiment and battery to Washington, at once. Harper's Ferry had been evacuated by the rebels, who were also moving in the direction of Washington. Our regiment and battery set out at once on the road for Hagerstown, arriving there at noon. Without stopping we marched on through Funkstown, arriving at Boonsboro, Maryland, at 3 P. M., where we halted for a rest. We found the people of the place loyal, and disposed to show us every possible attention. We halted on the public square, or common, and the ladies of the town gathered in large numbers and supplied many of us with cake and other refreshments. Here the regiment and battery rested until 5 P. M., when the march was resumed. Entering a pass of the South Mountain, the acclivity looming up on both sides, every precaution was taken against any possible surprise by the enemy. The battery was divided, one-half in the advance and the remainder in the rear of the column. At 9 P. M. we reached Middletown, where the people showed themselves in large numbers, as we passed their quiet homes. We made no stop at Middletown, but tramped along, tired and hungry, stopping about midnight and camping on a hill on the outskirts of Frederick City, Maryland, having marched thirty-six miles since daylight. Men from all the companies soon collected rails and built a camp-fire, illuminating the surrounding country and causing the ringing of a fire alarm in Frederick City.