Despite the potential downfalls inherent to being a first in a series, D-Day by Thompson presents itself as a rather developed introduction to the series and a concise overview of perhaps the world's busiest day ever. One may prepare to be a bit overwhelmed by the data involved (regiment information and the like, mainly), considering the sheer volume of manpower involved in this event, but even in the paragraphs that start to amass loads of numbers, Thompson contextualizes them fairly well and hurries the reader along quickly to more human elements (not to say the numbers of soldiers and their groupings were not "human").
One enjoyable aspect for me was Thompson's emphasis early on concerning the attitudes of the Allies involved, especially the air forces. I can understand their perspective: if they, as heavy bombers, especially, were doing such damage to the Axis powers especially in their infrastructure, why bother with such a massive infantry assault? It's easy for us today to generalize the "highlights" of WW2 and other major historical events, and just assume everyone was like-minded, but Thompson does a good job of bringing to life early on the diverse mindsets going into the battle from both sides (or, all sides, considering the less-than-chummy attitudes of Americans not named Eisenhower to Montgomery and other British generals). The section on Rommel was especially intriguing, as Thompson paints Rommel as a noble, intelligent military mind, and as later entries in the series do, we are lead to feel miraculous intervention alone brought the ending of WW2 how it occurred (despite the occasional comments from Thompson to the effect of a fatalistic approach to an Allied victory).
Thompson brings some aspects of the actual battle to life in a very engaging, first-person, in the action, sort of way. The chapter on the eastern British paratroopers assaults, especially, was very riveting. It was one chapter I wish had more detail but in a positive way, which is an ideal compliment for this series: its best entries make you want to seek out more expansive versions of the subject matter, and while D-Day is as massive a day as humanity has ever seen, this book encourages you to learn even more about it.