This book is an expansion to Bolt Action, the 28mm scale tabletop wargame set during World War II. Whilst there is historical detail within the narrative, this volume is not a history book – it is first and foremost a wargaming supplement. The intention of the team who put this book together was to provide a good mixture of scenarios, new units, and new rules whilst still giving some historical background for context. Some previously published rules and units have also been reprinted – this is to save players the expense of buying additional books for content which is vital to this volume, but might form only a small part of other books. The Siege of Budapest, the Soviet invasion of Hungary that led up to it, and the desperate German offensives to relieve the city covered kilometres of frontline; these battles lasted eight months and involved hundreds of thousands of combatants. Many important battles have not been presented as scenarios in this book, merely due to the constraints of the book size and the authors wish to present a variety of very different scenarios for players.