A Connecticut Yankee in King Arthurs Court by Mark Twain Chapter 43 Page 30

These early birds came scattering along after each other, about one every five minutes in our vicinity, during half an hour. They brought no armor of offense but their swords; as a rule, they carried the sword ready in the hand, and put it forward and found the wires with it. We would now and then see a blue spark when the knight that caused it was so far away as to be invisible to us; but we knew what had happened, all the same; poor fellow, he had touched a charged wire with his sword and been electrocuted. We had brief intervals of grim stillness, interrupted with piteous regularity by the clash made by the falling of an iron-clad; and this sort of thing was going on, right along, and was very creepy there in the dark and lonesomeness.

We concluded to make a tour between the inner fences. We elected to walk upright, for