Adam Clarke on 1 Kings 20:12

In the pavilions - This word comes from papilio, a butterfly, because tents, when pitched or spread out, resembled such animals; partly because of the mode of their expansion, and partly because of the manner in which they were painted.

Set yourselves in array - The original word, שימו simu, which we translate by this long periphrasis, is probably a military term for Begin the attack, Invest the city, Every man to his post, or some such like expression.