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Before Antietam: The Battle for South Mountain

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Robert E. Lee, after decisively repelling John Pope's August 1862 invasion of Virginia at the Second Battle of Manassas, took the offensive. Moving north into Maryland, Lee divided his forces to capture Harpers Ferry while continuing his advance further into Union territory. George B. McClellan, the new Union commander, learned that Lee had divided his forces, and advanced to attack the Confederates. The armies, from squad to corps level, fought hard in both cavalry and infantry actions for control of the three gaps across South Mountain, about sixty miles from the Federal capital. The victory McClellan's officers and men gave him forced Lee to fall back and regroup near the town of Sharpsburg, Maryland, thus setting the stage for the Civil War's bloodiest day which soon followed at Antietam Creek.
Three days before that September day, the opposing armies fought a series of engagements that came to be known as the Battle of South Mountain. Until Before Antietam, those battles existed in our history as only a footnote to the events at Antietam. Because of the work of John Michael Priest those terrible encounters now have their rightful place in American military history.

433 pages, Hardcover

First published November 1, 1992

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John Michael Priest

15 books12 followers

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5 stars
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21 (42%)
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Displaying 1 - 9 of 9 reviews
Profile Image for Francis X DuFour.
599 reviews4 followers
May 14, 2025
I’ve never before seen such a complete description of the Battle for South Mountain. There must have been a mountain of primary sources used for the book. It seems that at least half the participants dead, wounded, or captured on both sides are mentioned in the book. The detail is overwhelming and every significant dwelling, road, fence, bush, stone, etc. is referenced. Unfortunately, the generous number of maps in the book are barely usable due the poor terrain quality and almost invisible labeling of units/locations. It’s a good test of eyesight and power of observation to make sense of the maps. But if want to know the details of the battles for Fox, Crampton and Turner’s gaps, this the book for you.
Profile Image for Katherine Addison.
Author 28 books3,901 followers
October 7, 2023
This is an incredibly detailed account, using a host of primary sources (letters and diaries and memoirs and basically anything any of the people who were there ever wrote or said about it), of the ten days leading up to the battle of Antietam. Priest gives roughly equal time to both sides and as much attention to the enlisted men as to the officers. We see much less of the upper echelons (except J.E.B. Stuart being J.E.B. Stuart)---certainly much less than you would get in a more conventional historiography of South Mountain---so this is very much the worm's eye view. It is so detailed it's actually a little hard to follow what's going on, which is a very dim reflection of what it was like to be there.

The maps are equally detailed; I honestly found them all but impossible to read.
237 reviews6 followers
November 24, 2019
Great account of the Battle of South Mountain and the events in Lee’s Maryland Campaign that preceded it. Although not as well known as the Battle of Antietam, South Mountain was a savage precursor to that battle.

The author, John Michael Priest, does a good job telling the events of the battle, describing unit movements down to regimental level. The maps are good and plentiful, but I would still suggest having other maps available that show the bigger picture. He also mixes in personal stories from soldiers on both sides, as well as civilians.

A fine book on an often overlooked battle.
Profile Image for Greg Lowe.
29 reviews
October 16, 2022
Before Antietam: The Battle for South Mountain

I really wanted to like this book, but I must say that it was a slog to get through it. It is meticulously researched and carefully documented almost to the point of overkill. The author’s use of primary documents makes the narration rather uneven as it jerks and sputters along. Nonetheless, in its exactitude it reminds us of the wasteful horror that is war. Despite the unwieldy nature of the presentation overall, there are some moments that make it worthwhile. I could see that it could be of greater value to the academic historian than to the casual reader.
Profile Image for 'Aussie Rick'.
450 reviews262 followers
December 5, 2009



This was the first book of John Michael Priest that I had ever read and I found it to be a well researched and well presented account of the 'Battle for South Mountain'. I enjoyed it so much that I ordered his other book "Antietam: The soldiers Battle' as soon as I finished this book. He presents the fighting through the eyes of the Northern and Southern soldiers and it is done is such an easy manner that the narrative flows along quite well. The only criticism I have of the book itself is the standard of the maps. There is quite a number of maps that assist the reader to follow the accounts of the fighting but I believe that he could have done a better job in their presentation. Overall this book offers the reader a very good account of this forgotten battle. Well worth the money.
Profile Image for John E.
613 reviews10 followers
March 7, 2011
Excellent and moving study of the prelude to the Battle of Antietam (Sharpsburg) in September of 1862. Because it is based almost exclusely on the letters, memories, and diaries of participants in the actions one get a detail that is almost always lacking in more narrative histories. Fully one-fifth of the text pages are maps and thus one can follow in exacting detail the movements of the units involved; however, the maps, while comprehensive, are not the most professionally done. I found that I had to use a pink and blue markers to mark on the maps to follow what was happening. Because of the detail and the constant referral to the maps this is a slow read.
Profile Image for Jimmy.
770 reviews28 followers
July 29, 2015
This book is certainly better than the author's Wilderness set. Before Antietam does a far better job covering the role of brigade and division commanders during the battle, although it was still sketchy concerning the activities and decisions of the Union corps commanders. The author also extensively covers the nine days leading up to the battle, starting with the Confederates' crossing of the Potomac, and describes the decisions made by the two army comamnders. However, the maps in this section were not that good in quality, showing only the movement of units and location of skirmishes, usually each chapter had just a single general map of the entire central Maryland region.
Profile Image for Joe Owen.
110 reviews3 followers
March 20, 2014
Great read about Robert E. Lee's first invasion of the North with the Army of Northern Virginia. This battle would set up immediately afterwards the Battle of Antietam in September 1862.
Displaying 1 - 9 of 9 reviews