On 14 September 1874, less than a decade after the end of the US civil war, the former Confederate general James Longstreet was back in arms. This time, he was seeking to prevent an insurrection: a white supremacist bid to take over New Orleans. Once seen by northerners as among the three most notorious Confederates – with his commander, Robert E Lee, and president, Jefferson Davis – Longstreet now led state militia and city police. His troops were Black and white, reflecting an unlikely commitment to post-war civil rights that would waver in later years. His complex life is the...