Memorials to mark century-old horror of World War I

YPRES, Belgium - Memorials will be held on Sunday and Monday to mark the centenary of one of World War I's most bloody battles.

The Third Battle of Ypres, fought in western Belgium a century ago, was as bad as World War I would get. Half a million soldiers were estimated to have been killed or wounded during the 100-day battle and one name keeps coming back: Passchendaele, now as grim a symbol as any field of war ever remembered.

Monday marks the centennial of the start of the Allied offensive, which ended up barely moving the front line.