The British, Soviets, and Americans unite in this chapter of the six-volume WWII history by the legendary prime minister and Nobel Prize recipient.   The Grand Alliance describes the end of an extraordinary period in British military history, in which Britain stood alone against Germany. Two crucial events brought an end to Britain's isolation. First was Hitler's decision to attack the Soviet Union, opening up a battle front in the East and forcing Stalin to look to the British for support. The second was the bombing of Pearl Harbor. US support had long been crucial to the British war effort, and here, Winston Churchill documents his efforts to draw the Americans to aid, including correspondence with President Roosevelt.   This book is part of the six-volume account of World War II told from the unique viewpoint of a British prime minister who led his nation in the fight against tyranny. In addition to the correspondence with FDR, the series is enriched with extensive primary sources. We are presented with not only Churchill's retrospective analysis of the war, but also memos, letters, orders, speeches, and telegrams, day-by-day accounts of reactions as the drama intensifies. Throughout these volumes, we listen as strategies and counterstrategies unfold in response to Hitler's conquest of Europe, planned invasion of England, and assault on Russia, in a mesmerizing account of the crucial decisions made as the fate of the world hangs in the balance.   "A masterly piece of historical writing . . . complete with humor and wit." --The New Yorker