This thesis analyses the occurrence of defaulters, defaulting and defaults in Hampshire’s militia during the period 1625-1640 and demonstrates the levels within both the County and its regiments. This is important because it also indicates what the relationship was between individuals and their company and/or regiment, and between the company/regiment and the wider County militia. It is the first thesis to focus exclusively on Hampshire for this period. There will be comparisons of varying defaults relating to the infantry and mounted elements, to ascertain which defaults were most common, where they most frequently occurred and which segment of society was most likely to default. In taking the premise that defaulters, defaulting and defaults, were all at a low level through the period, consideration will be given to their comparatively higher level within the horse. It is this that constitutes the main argument of this thesis, namely, that there were peaks and troughs in defaulting, but that across the period it averaged at a low level. Historians, both of militia and through survey histories, have used a wide range of examples from Hampshire. Some of those will be re-used here, but this thesis uses a greater breadth and depth of the primary material in the Jervoise of Herriard collection held at Hampshire Archives as well as other primary and secondary sources.