The speakers at the 2018 Helion conference offer a variety of insights into the depth and direction of research into the Thirty Years’ War, with particular reference to the war’s effect on the British Isles, the careers of the officers from its shores who participated in the conflict, and the ‘trickle-down’ effect of the war into the military thinking and technology of those isles. Keynote speaker Professor Steve Murdoch examines the changes in understanding of British military participation in the Thirty Years’ War from a once unsophisticated and dismissive approach to a more enriched and interesting field of study. Keith Dowen examines the work of Catholic Irish colonel Gerat Barry, which has been largely overlooked. Micha? Paradowski looks into the careers of three officers from the British Isles who fought abroad – Arthur Aston Jr, James Butler and Scotsman James Murray. Arran Johnston considers the importance of General Alexander Leslie and his officer corps, and the importance of their overseas service in the Thirty Years’ War as the basis for the effectiveness of the Scottish army in the Bishops’ Wars. Prof. Martyn Bennett explores the process of appointment of the rival command structures in 1642, at the start of the English Civil Wars. David Flintham considers the foreign, especially Dutch, influence on English fortification during the period, the methods employed and those who practiced them. Stephen Ede-Borrett examines contemporary vexillology, and how much the Thirty Years’ War influenced the military flags used by the English Armies from 1639 to 1651.