It includes a "quick and easy" system for resolving large-scale battles involving both military units and "heroic individuals" (the player characters).
"An Echo Resounding" is a fantasy novel by American authors Patricia A. McKillip and Katherine A. Kinkle. If you're looking for a PDF version of the book, I should let you know that I don't have direct access to copyrighted materials, including e-books.
The PDF is renowned for its brevity and elegance, providing a complete toolkit for a campaign without the bloat of hundreds of pages of rules.
An Echo Resounding: A Review and Summary Author: Chris McDowall Genre: Tabletop Role-Playing Game Supplement / Rules-Light Fantasy