en_tn/2ch/21/09.md

crossed over

"crossed the border into Edom" or "went to Edom"

It was night when he rose up ... surrounded him and his chariot commanders

It may be helpful to reorder this sentence and to add implicit information. Alternate translation: "The Edomites surrounded him and his chariot commanders, but Jehoram and his army fought against them and escaped during the night" (See: rc://en/ta/man/jit/figs-explicit)