Long wars produce many lessons, and analysts often draw different ones from the same events. Some stress the limits of external intervention, others the importance of sustained commitment, and others the role of local politics and governance.
Disagreement is not necessarily a sign of poor analysis. It can reflect different assumptions about goals, costs, and what the alternatives would have been.
Useful assessments state their assumptions, compare against alternatives, and use primary sources such as inspector general reports and official histories.
