Book excerpt: Many commanders in the American Civil War (1861-1865) served in the Mexican War (1846-1848). This book explores influence of the earlier war on those men who would become leaders of Federal and Confederate forces. Kevin Dougherty discusses professional soldiering before both wars. He shows experiences of twenty-six men in Mexico, thirteen who would serve the Confederacy and thirteen who would remain with the Union. He traces how tactics they used and reactions they had to Civil War combat reveal a remarkable connection to what they learned campaigning against Santa Anna and Mexican generals. Personalities discussed range from well-known leaders to lesser-known figures, from geniuses to mediocrities and from aged heroes to developing practitioners. Impact of these experiences on major tactical decisions in the Civil War is far-reaching--Publisher's description.