Regarding information from prisoners:
Mark Clark in his autobiography "Calculated Risk" revealed at the wars end,in Italy, they 'bugged' a villa and stuffed it with captured German generals. After a two days of near silence they sent in to their captives some crates of Scotch; about two hours later the shorthand writers were working their heads off as the German generals gushed forth a torrent of information.
There are many ways to skin a cat and if you can't skin then hold a leg - this quote owes a lot to A. Lincoln.
"Crusade in Europe" was the title of Eisenhowers autobiography - I don't believe it had any religious significance.