Ride horseback with this killer accordion
If you were worried about attackers while riding horseback, this 1917 invention might have helped.
How did it work? You saddled your horse with a deadly speared accordion. When bandits rode beside you, you pushed a switch and sent the spears shooting at them (the application notes that you could also handle a gun at the same time). You could then repeat your accordion attack until the robbers were all played out.