This remains an important book of 181 pages with an extensive bibliography and index. It covers the years 1535-1687 with the stated purpose to examine how, regardless of being significantly outnumbered and completely surrounded by hostile tribes with many of these tribes having European allies (France, Sweden, Colony of Maryland), the Iroquois will so throughly and completely defeat their neighboring Indian enemies to become "the dominant power in their region until" the American War for Independence.
Part of the author's purpose is to address what he considers the misplaced notion of attributing this astounding Iroquois military success to the "magical" Iroquois Confederation, an alleged inherent warlike disposition or a superior intellect. In this, he appears to be addressing earlier theories as to the reasons for Iroquois success. He may overstate his case regarding the lack of contribution from the Iroquois political institutions. The author does not overstate the Iroquois success, however. He demonstrates the Iroquois failures through the mid-1600s, their rapid (but limited) success thereafter, their lack of military success against non-neighboring tribes, and their inability to maintain an expansive empire.
The author appears to have a through knowledge of the primary (primarily Jesuit Relations and Colonial Documents of New York) and secondary (Parkman et el) sources and interacts with them throughout the book.
A problem with this book (1940 edition-3rd printing 1967) is some inconsistant dates used. On Pg 68 the author has the "Neutral and Erie Wars of 1660-65" and Pg 97-98 states the Neutrals were defeated in 1651 and the Erie defeated in 1654 (both tribes being dispersed and effectively destroyed as tribal units).
The author does argue for an economic motive (the fur trade) fueling the conflict between the Iroquois and their enemies. He also suggests that this economic motive was a positive factor in maintaining peace within the Iroquois confederacy itself. To suggest that economic motivation for war has been discredited or that the author has underlying "marxist concepts (sic)" appears completely unfounded. The author acknowledges that the European-Indian trade is monopolistic and mercantile in nature (government controlled economies). Prices are fixed, competition does not (for the most part) exist, there is no "Free Market Capitalism" here. This is not a book about economics but a book about the reasons for the unlikely Iroquois victory over their neighbors.