Innocence Lost: The Battle of First Bull Run is an introductory level game on the first major battle fought in the US Civil War.

Each turn represents a half hour of time and there are up to 18 turns in the game. Infantry and Cavalry units are Brigades, while Artillery units represent divisional-level batteries. Players issue orders to their various commanders and draw leader activation markers to determine which leader and their subordinate units activate. Assault combat and artillery bombardments are used to resolve combats between opposing units.

Each copy of Innocence Lost is composed of the following:

Three 11 by 17 and three 8.5 by 11 map sheets with game tracks, unit and terrain ID.

128 double-sided, un-mounted counters (mounted counters are available from the publisher for an additional charge)

Six pages of rules

—description from the publisher