President George W. Bush rarely was the voice of realism'' on the Iraq war and too often failed to lead,'' according to a new book by Bob Woodward examining how the president handled the war effort during some of the conflict's most difficult years. Woodward's book, The War Within: A Secret White House History, 2006-2008,'' told of a president detached, tentative and slow to react to the escalating violence in Iraq, The Washington Post reported on its Web site Thursday night. But once Bush decided that thousands of additional troops were needed, he moved with focus and determination even though top military advisers resisted him, wrote Woodward, a Post assistant managing editor. The book is the fourth by Woodward to examine the inner debates of the Bush administration and its handling of the wars in Iraq and Afghanistan. It was scheduled for release Monday. Spokesman Blair Jones said the White House had no immediate comment.