A few comments...
The first weapon was a bone used by a caveman to hit another caveman. Uh uh. Even monkeys have been observed throwing stones at enemies. Collections of round stones perfect for throwing have been found at Homo habilis sites up to 2 million years old. They didn't just get there by accident. No use has been shown to be effective for them except as weapons to be thrown.
The famous Roman sword was the Gladius? Yes, it was the Gladius Hispanicus, copied by the Romans from their fierce Spanish enemies.
“God made all men, but Samuel Colt made them equal," also monkeys and chimps. With a gun, they're deadly. Soon, also robots!
The Maxim gun was the first true machine gun.
Michael Brunk’s HEAVY METAL says, During World War I (1914-1918) the British developed and used the first armored track-laying vehicles. To maintain secrecy, the vehicles were shipped to the battle zone in crates marked "tanks", hence the origin of the name.