Remained on Bolivar Heights last night; regiment went on picket about 10 o'clock p. m.; train mostly crossed the river last night, but did not all move till near noon to-day; heat intense, but haven't marched hard. The train, as anticipated, did not go further than Sandy Hook, as the mules were completely fagged out, so our brigade was ordered to join the Corps which is at Frederick; camped at Jefferson City. We were startled yesterday afternoon when half-way up the mountain, by the explosion of a magazine filled with ammunition. The report was alarming and was followed by a shower of stones, gravel, sticks, pieces of shell and dirt which was very demoralizing, besides, we didn't know what to make of it at first. It gave us quite a scare; suspected a mine at first. Many men have had sunstrokes and died to-day.
SOURCE: Lemuel Abijah Abbott, Personal Recollections and Civil War Diary, 1864, p. 128-9