<p>The book clearly explains and illustrates the mechanics of how Roman commanders - at every level - drew up and committed their different types of troops for open-field battles. It includes the alternative formations used to handle different tactical problems and different types of terrain; the possibilities of ordering and controlling different deployments once battle was joined; and how all this was based on the particular strengths of the Roman soldier. Covering the period of &quot;classic&quot; legionary warfare from the late Republic to the late Western Empire, Ross Cowan uses case studies of particular battles to provide a manual on how and why the Romans almost always won, against enemies with basic equality in weapon types - giving practical reasons why the Roman Army was the Western World's outstanding military machine for 400 years.</p>