20 Sihon, however, did not trust Israela to pass through his territory. He mustered all his troops and encamped at Jahaz and fought with Israel.

Read Judges 11:20 Using Other Translations

But Sihon trusted not Israel to pass through his coast: but Sihon gathered all his people together, and pitched in Jahaz, and fought against Israel.
but Sihon did not trust Israel to pass through his territory, so Sihon gathered all his people together and encamped at Jahaz and fought with Israel.
But King Sihon didn’t trust Israel to pass through his land. Instead, he mobilized his army at Jahaz and attacked them.