Why were zeppelins easy to target?

During the revolutionary war the thirteen states were bound together by the? Why did the British Suffer Heavy Casualties during World War 1? What does one by land two by sea mean? What was the Social effects of opium war? How can the old WW2 warplanes shoot right through their spinning propellers? Why did Korea split in world war 2? Why Did women volunteer in World War 1? What men died on July 4 1846? What plane drooped the atomic bomb in world war 2? What motivated the colonial poor to fight the British? In what year did the Allies begin to push back the Japanese advance? What did The Bay of Pigs resulted in? What was The National Liberation Front was led by Communists and supported by? At the time of World War 1 why did everyone have to work at the big house? Why have suburbs grown so rapidly int he developed world? What technological developments during the 1950s contributed to an arms race that would last for more than 30 years? How many people died in the civil War from Illinois? How did the British plan to win their battles in the south? When did the fighting of World War 1 stop? What were some new technology used during the civil war and their description?