This work is the continuation and revision of a project started in 2006 with the publication of In Contact by the Combat Studies Institute. The original concept was to present a series of military vignettes in a style similar to the widely used case-study methodology commonly found in military literature. The final version of Between the Rivers, instead of following this strict case-study format, presents combat action vignettes as narrative accounts of the various types of actions challenging combat leaders in Iraq in 2003-2005.