This is the Block of the Month for September 1, 2007, on the forum of Quilting Board.  It is from Quilter’s Cache and I love the block.  I had a few problems with the parallelograms but think I have worked out a way to manage those and I think the block is impressive. 

According to a note on the Quilter’s Cache web site, the block was named for a river crossing near Sharpsburg, MD, which was used by the Confederate Army of Northern Virginia just before the battle at Antietam.