Igor Markov's answer to Why does the US government spend so much on military? Jon Davis' answer to Given that China is fine without blue-water navy, why does the US need one? Being even is the Deadliest form of Warfare
Imho the most influential war in history is the Caesar Augustus' failing attempt to conquer the Germans. He sent two legions over the Limes Renano expecting to tame the german population. It didn't happened: in the Battle of Teutoburg Forest the army of 15.000 well trained roman solders was completely slayed but Germans. In a what if...
It was told that the Antietam battle was the most bloodiest battle in military history. The Battle of Antietam, or Sharpsburg was fought September 17, 1862. The Battle of Antietam happened on September 17, 1862. It was one of the first Civil War battles to occur in the north-and also one of the deadliest. Nearly 23,000 people were killed, the highest death-toll for any single-day battle in U.S. history.