Lee at the Alamo (fiction)

Harry Turtledove, the Stephen King of alternative history fiction, wrote and posted a story on Tor.com yesterday, called Lee at the Alamo, and it's worth the read. The title alone tells the plot: then-Lieutenant Colonel Robert E. Lee is in command of the Department of Texas on the eve of that state's secession from the Union and through circumstances, he and his men wind up taking refuge inside the famed fort and subsequently fighting defending against a siege by Texas irregular military units. Does fate strike twice and doom these defenders just as it doomed the fifteen years earlier? You'll just have to read to find out.