On War by Carl von Clausewitz is a seminal work in the field of military strategy and tactics. Volumes 2 and 3 delve deeper into Clausewitz's theories on warfare, including discussions on strategic planning, the role of the military in politics, and the concept of "total war."

One of the key takeaways from these volumes is the idea that war is not an isolated event, but rather a continuation of political means through different methods. Clausewitz stresses the importance of understanding the political context in which wars are fought, and how military objectives must be aligned with political goals.

Additionally, Clausewitz's concept of "friction" in war, which refers to the unpredictable and chaotic nature of conflict, is thoroughly explored in these volumes. He argues that successful military leaders must be able to adapt to changing circumstances and think critically under pressure.

Overall, Volumes 2 and 3 of On War are essential reading for anyone interested in the theory and practice of warfare. Clausewitz's insights into the complexities of armed conflict are as relevant today as they were when he first penned them in the early 19th century.

Book Description:
Perhaps the most famous work on the philosophy of war, and the effective use of military force, by a European author.