"Germania" is a historical and ethnographic work that provides a detailed description of the lands, customs, and tribes of the Germanic people in the first century AD. The author, a Roman historian and senator, offers a comprehensive account of the geography, anthropology, social institutions, and military practices of the Germanic tribes, often comparing their culture and values to those of the Romans. The work is considered a valuable source of information about the ancient Germanic tribes, despite its possible biases and inaccuracies.

"War Before Civilization" challenges the common perception that prehistoric societies were peaceful and that war only emerged with the advent of civilization. The book presents a comprehensive analysis of archaeological and ethnographic evidence, demonstrating that prehistoric warfare was frequent, deadly, and unequivocally deliberate. It argues that intertribal conflicts were conducted with strategic planning and that rates of casualties could be as high as those found in modern wars. The book dispels the myth of the noble savage and suggests that the practices of war have deep roots in humanity's past, fundamentally shaping human society long before recorded history.