In the '60's two earlier installments (Patriot 's Progress and Retreat and Recall) of this trilogy appeared. It's an American Revolutionary set piece featuring a young surgeon, John Frayne, now caring for the wounded of the Battle of Brandywine in a firmly religious Moravian settlement. There are as many as 300 casualties to be taken care of, reduced at one point by almost 100 in a week of raging ""flux,"" and the dead are disposed of unceremoniously by night. On the personal (a euphemism if there ever was one) side there's Frayne's interest in the more elegant Sarah Locker which cedes to the simpler, worthier virtues of the Moravian girl in whose house he's quartered. . . . Authentic Americana but sober and honest as the day is long--it's sure to seem much longer.