From Lexington Green in 1775 to Yorktown in 1781, one regiment marched thousands of miles and fought a dozen battles to uphold British rule in America: the Royal Welch Fusiliers. Along the way, the Fusiliers adopted new tactics and promoted new leaders which together laid the foundations for the subsequent performance against Napoleon. Drawing on a wealth of new research, Mark Urban, author of the bestselling Rifles, reveals the inner life of the regiment and, through it, of the British Army as a whole as it lost the battle against the American revolutionaries, but simultaneously revolutionised the way Britain fought.