The guns of war have fallen silent for Hollywood. Studio executives, who could once count on Americans filling theaters for just about any war movie they produced, are finding this year's war flicks to be a bunch of duds. "Lions for Lambs," Robert Redford's case against the war in Afghanistan, is a flop. It stars Mr. Redford, Meryl Streep and Tom Cruise and may not make back its $35 million price tag. Brian De Palma's "Redacted" played to empty seats. Even "The War," Ken Burns's much-anticipated World War II documentary that aired on PBS in September, met a less-than-explosive reception....