The regimental or battery set of colours was more than simply a unit designation, issued for the ease of a commander in identifying his units in the field. It was the very symbol of the regiment; it was its heart, the thing that drew its members together. As such it was fiercely defended in action, where it flew in the centre of the line. Complemented by numerous illustrations, including eight full page colour plates by Rick Scollins, this book by Philip Katcher provides a fascinating examination of the Union flags of the American Civil War (1861-1865).