Book excerpt: In Investigating Civilian Casualties in Time of Armed Conflict and Belligerent Occupation Alon Margalit discusses the appropriate State response to civilian casualties caused by its armed forces. Various legal and practical challenges, arising when investigating the fatal consequences of the use of force, are examined through the practice of the US, the UK, Canada and Israel during military operations in Afghanistan, Iraq, Somalia and the occupied Palestinian territory. Alon Margalit considers this topical and sensitive issue within a broader context, namely the public scrutiny of State behaviour and influence of human rights law during armed conflict. The debate over the scope of the duty to investigate reflects competing approaches looking to (re)shape the balance between military necessity and humanitarian considerations.