100 years ago, in the spring of 1864, the Overland Campaign ignited a ferocious clash between two titans of US military history: Ulysses S. Grant, the rugged and relentless Union general, versus the Confederate general Robert E. Lee, a suave southern officer and master of strategy.

Theirs was a hotly-contested rivalry, and the debate still rages on to this day - who was the better general? To help you decide, we're joined by Jonathan D. Bratten, an engineer officer and command historian in the Maine Army National Guard.

Produced by James Hickmann and edited by Dougal Patmore.

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