From the Italica Press website:
Agrippa’s treatise is the fundamental text of Western swordsmanship. Just as earlier swordsmanship can be better understood from Agrippa’s critiques, so too was his book the starting point for the rapier era. Every other treatise of the early-modern period had to deal explicitly or implicitly with Agrippa’s startling transformation of the art and science of self-defense with the sword. Likewise, all of the fundamental ideas that are still used today — distance, time, line, blade opposition, counterattacks and countertime — are expressed in this paradigm-shifting treatise. This is a work that should be on the bookshelf of anyone interested in the history, practice or teaching of fencing.
The Ettenhard manual of 1675 is being relased in PDF format one chapter at a time as part of the Destreza Translation and Research Project which is "dedicated to researching historical Spanish fencing and sharing the knowledge with the public."