The watchmen of Saul - Those who were sent out as scouts to observe the motions of the army.
Melted away - There was no order in the Philistine camp, and the people were dispersing in all directions. The Vulgate has, Et ecce multitudo prostrata, “And behold the multitude were prostrate;” many lay dead upon the field, partly by the sword of Jonathan and his armor-bearer, and partly by the swords of each other, 1Sa 14:20.