This was an extremely watchable series, which explained the First World War, its causes and effects, better than I've ever heard it. Much of its strength was that it didn't concentrate only on strategy and what the upper echelons were doing, but looked at how events impacted the men in the trenches. Lots of battlefield and trench film demonstrates conditions, as well as first hand accounts (mostly letters) from those involved. Should be compulsory school viewing.
An unusual but very intelligent look at the First World War, taking in politics and geography. The programmes are done by 'theme' rather than the usual simple chronological format, and it was all the better for it. Highly recommended.