An order of battle should be distinguished from a table of organisation, which is the intended composition of a given unit or formation according to the military doctrine of its armed force. As combat operations develop during a campaign, orders of battle may be revised and altered in response to the military needs and challenges. Also the known details of an order of battle may change during the course of executing the commanders' after action reports and/or other accounting methods (e.g. despatches) as combat assessment is conducted.