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This paper presents an analysis of the Provisional Irish Republican Army's (PIRA) brigade level behavior during the Northern Ireland Conflict (1970-1998) and identifies the organizational factors that impact a brigade's lethality as measured via terrorist attacks. Key independent variables include levels of technical expertise, cadre age, counter-terrorism policies experienced, brigade size, and IED components and delivery methods. We find that technical expertise within a brigade allows for careful IED usage, which significantly minimizes civilian casualties (a specific strategic goal of PIRA) while increasing the ability to kill more high value targets with IEDs. Lethal counter-terrorism events also significantly affect a brigade's likelihood of killing both civilians and high-value targets but in different ways. Killing PIRA members significantly decreases IED fatalities but also significantly decreases the possibility of zero civilian IED-related deaths in a given year. Killing innocent Catholics in a Brigade's county significantly increases total and civilian IED fatalities. Together the results suggest the necessity to analyze dynamic situational variables that impact terrorist group behavior at the sub-unit level. [ABSTRACT FROM PUBLISHER]

What explains support for violence against the state? The surge in survey-based studies in (former) conflict areas has improved our understanding of the determinants of armed conflict. Yet, the potential interaction between grievances and political opportunity structure has received little attention in microlevel studies. Integrating common arguments from the civil war literature with the political behavior tradition, this article argues that perceived political efficacy, a central component of the political opportunity structure, moderates the association between individual and group grievance and people's support for political violence. It represents a first individual-level test of the argument that perceived political opportunity structure and grievances combine to explain internal armed conflict. Using original survey data from Guatemala, Nepal, and Northern Ireland (2016), we find robust empirical evidence that support for violence increases with perceived grievance and decreases with political efficacy; and some evidence of an interaction between the two. [ABSTRACT FROM AUTHOR]