MINISERIES PREMIERE: On the 100^th anniversary of the start of what eventually was called World War I, History Channel presents something that’s fairly unusual: an actual nonfiction miniseries about history. Its four hours, presented in one mammoth burst tonight, make the case that WWI introduced modern warfare on several fronts – in this case, literally. And with tanks, zeppelins, submarines and chemical weapons all employed, it makes for a strong argument. Armored Beasts begins the series at 8 p.m. ET, followed by hours with such frightening titles as Massive Air Attacks, Clouds of Death and Underwater Killers.