In April 1944, Exercise Tiger proved to be a grisly rehearsal for the D-Day Invasion less than two months later.
At Cedar Mountain, Nathaniel Banks set out to distract Lee by capturing the rail junction at Gordonsville. But Sonewall Jackson got there first.
By the time the Civil War began, opposing forces in Bleeding Kansas and Missouri had been killing each other for five years. And were very good at it.