These were the soldiers of the 3 tribes that were fulfilling their obligation to lead the Israelites into battle for settling on the East side of the Jordan River. (See: [[rc://en/ta/man/translate/figs-explicit]])
This refers to not just honor but submission to his commands and to treat him as the commander of their army as they had followed Moses. (See: [[rc://en/ta/man/translate/figs-explicit]])