Browsing named entities in Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 11. (ed. Frank Moore). You can also browse the collection for Boonsboro (Maryland, United States) or search for Boonsboro (Maryland, United States) in all documents.

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In the midst of preparation for this movement, a telegram from Major-General Sigel reached me, stating that the enemy had that morning retired from before Maryland Heights, and was marching with his main body up the Middletown Valley toward Boonesboro. The question then was — were the rebels marching for Pennsylvania, or coming eastward by the Jefferson or Middletown pikes? I concluded to await events in Frederick City, satisfied they would not be long delayed. As Johnson still held the morning, and sent one squadron to Berlin and Sandy Hook to protect the Baltimore and Ohio Railroad. At 11:30 A. M. I received a telegram from General Howe to repair to Frederick and ascertain the force of the enemy reported in the vicinity of Boonesboro. Calling in my forces I arrived at Frederick at eight o'clock P. M., where I received orders to report in person to Major-General Wallace, at Monocacy Junction, and by him was ordered to take two pieces of Alexander's battery and move forward
ter this brigade was cut off from the main force and they quietly withdrew to the other side of the Potomac river, via Shepherdstown ford, and covered that and the Antietam ford; the balance of the First division (Brigadier-General Merritt) fell back and took position on the right of the army. On the night of the same day (twenty-fifth) the Third division (Brigadier-General Wilson) was sent across the Potomac river, via Harper's Ferry, Virginia, and took position in the vicinity of Boonsboro, Maryland. On the twenty-sixth the cavalry remained in the same position as on that of the twenty-fifth instant. On the twenty-seventh, the First New York Lincoln cavalry was ordered from Brigadier-General Duffie's division to Brigadier-General Averell's division, and the Twelfth Pennsylvania cavalry in the same division was ordered to report, temporarily, to Brigadier-General Stephenson, at Harper's Ferry, Virginia; the balance of Brigadier-General Duffie's division was dismounted and or