A particular triumph for the OSS was the role it played in conveying intelligence from southern France in the run-up to the Allied landing on the French Riviera on August 15, 1944. Thanks to Donovan's spies, said Colonel William Quinn, the invading army "knew everything about that beach and where every German was." Donovan was present for that invasion, too, after which he returned to Rome for a secret meeting with Hitler's envoy to the Vatican, Ernst von Weizsäcker. Shortly afterwards, he met with Marshal Tito to discuss OSS operations in Yugoslavia. Also in August 1944, Donovan came into conflict with Churchill over the OSS's support for Greek anti-royalists.