The only Youtube alert I have is for this person, Emperor Tigerstar, who creates wonderful animated history maps. War and empire are his/her themes: the Japanese invasion of Manchuria, the Korean War in 30 seconds, the rise and fall of the Roman Empire, and World War I. His Youtube page is here (he has over 300 videos posted) and you'll see that he/she has other video sets to offer as well on religion, explorers and barbarians. To whet your appetite here two short samples: the rise and fall of the Ottoman Empire in under 5 minutes and the Franco-Prussion war day by day in under 2 . Enjoy.