1 Samuel 14:13-15

13Then Jonathan climbed up on his hands and feet, and his armor-bearer after him. And they fell before Jonathan, and his armor-bearer killed them after him.

14And that first strike, which Jonathan and his armor-bearer made, killed about twenty men within as it were half a furrow's length in an acre of land.

15And there was a panic in the camp, in the field, and among all the people. The garrison and even the raiders trembled, the earth quaked, and it became a very great panic.