Sixty years ago today the guns that thundered round Fort Sumter began the third and greatest modern civil war fought by English-speaking people. This war was quite as full of politics as were the other two-the War of the American Revolution and that of Puritan and Cavalier. But, though the present Chronicle never ignores the vital correlations between statesmen and commanders, it is a book of warriors, through and through.I gratefully acknowledge the indispensable assistance of Colonel G. J. Fiebeger, a West Point expert, and of Dr. Allen Johnson, chief editor of the series and Professor of American History at Yale.WILLIAM WOOD,Late Colonel commanding 8th Royal Rifles, and Officer-in-charge, Canadian Special Mission Overseas.QUEBEC, April 18, 1921