Armorbearers were assistants to warriors; a sidekick, if you will. They carried armor, of course, but also weapons. They needed to be strong, but also courageous. They finished off any enemy that their warrior had struck down. They watched for the enemy to attack from a blind spot to their warrior. Should the enemy wound their warrior, the armorbearer was often looked to, to finish off his warrior, so that the enemy wouldn't torment him or shame him in death.
Spiritually, we need to be strong for other warriors, encouraging them to step out in faith and helping them slay the enemy. We need to be on guard for them in prayer. We can also thrust others threw, with the Word of God and through prayer, when they have been mortally wounded by the lies of the enemy.
This takes being a tree of life to others to a whole new level. A level of warfare.
There are many different people we can be an armorbearer for: Christ, your pastor, another leader, a spouse, a friend, even the unbeliever. I hope to expound on this more in the future. For now, dear reader, just be in prayer on how you can be armorbearer and to who.