Balloons 1. How could flying – even slowly – be used as an advantage in battle? The Gatling Gun 2. This gun needed 4 men to operate it. The gun could fire 200 rounds in a minute! How many rounds would that be for each man? Iron Ships and Submarines 3. Why would these ships be much harder to sink than wooden ships? Advances in Firearms 4. Why does a rifled barrel have an advantage over a non-rifled barrel? What advantage does a revolver or a repeater have over a musket? The Telegraph 5. Why is communication so important from the frontlines of battle to the command centers? Trains 6. People are not looking to travel that much during wartime. Why would having trains matter?