Fall upon and Set upon

Fall upon verb - Find unexpectedly.

Set upon is a synonym for fall upon in action topic. In some cases you can use "Set upon" instead a verb "Fall upon", when it comes to topics like devastate, pounce. popular alternative

Set upon verb - Assail or attack on all sides: "The zebra was beset by leopards".

Fall upon is a synonym for set upon in devastate topic. You can use "Fall upon" instead a verb "Set upon", if it concerns topics such as pounce. popular alternative