The gathering of the tribes in Hebron marks a rare moment of national unity, bringing the military leadership and the entire nation together for a single purpose: crowning David as king. The warriors who arrived were highly skilled military men, trained in organizing battle lines [מצודת ציון, שטיינזלץ]. They arrived with absolute determination. Unlike hesitant soldiers whose minds are divided during war, torn between fighting and retreating, these fighters came with total decisiveness and clear purpose [מצודת דוד].
Hosting such a massive army required enormous preparation. Yet, the soldiers lacked nothing to eat or drink, as their fellow Israelites had taken care to prepare all the necessary provisions for them well in advance [רש״י].
This profound national unity extended to everyone else in the nation as well. Some suggest that almost no one was left behind at home, as the vast majority of the people joyfully traveled to Hebron [מנחת שי בשם רש״י]. However, the primary approach among commentators is that there were people who remained in their hometowns and could not physically attend the coronation [מצודת דוד, מלבי״ם]. Despite their physical distance, the representatives who did travel to Hebron perfectly expressed the shared will of the entire nation [שטיינזלץ]. Ultimately, the people united with a single heart, acting with complete honesty, free from deceit or any hidden motives [מצודת דוד].