To be loyal means "having or showing complete and constant support for someone or something."
No one was more loyal to David then his Mighty Men. Some of them, the Bible says, used to be loyal to King Saul but then went over to David's side. There were other warriors not listed as the Mighty Men who "came to David at Ziklag while he was banished from the presence of Saul of Kish (they were among the warriors who helped him in battle; they were armed with bows and were able to shoot arrows or to sling stones right handed or left-handed; they were kinsmen of Saul from the tribe of Benjamin)."
Then there were the Gadites who defected to David at his stronghold in the desert. "They were brave warriors, ready for battle and able to handle the shield and spear. Their faces were the faces of lions, and they were as swift as gazelles in the mountains."
There were other Benjamites and some men from Judah who "also came to David in his stronghold." When David came out to meet them he said to them, "If you have come to me in peace, to help me, I am ready to have you unite with me. But if you have come to betray me to my enemies when my hands are free from violence, may the God of our fathers see it and judge you."
But Amasi, Chief of the Thirty said, "We are yours, O David! We are with you, O son of Jesse! Success, success to you, and success to those who help you, for your God will help you."
Then there were men of Manasseh who "defected to David when he went with the Philistines to fight against Saul." The Bible says they helped David against raiding bands, for all of them were brave warriors, and they were commanders in his army. Day after day men came to help David, until he had a great army, like the army of God."
Some of them, the men of Benjamin, the kinsmen of Saul and who had remained loyal to Saul, when they reached their fill of what Saul was doing, up and left Saul and transferred their loyalty to David.
Loyalty doesn't just happen.
Loyalty is a result of a leader respecting those he or she is leading. If the leader doesn't respect the followers, loyalty will not make an army an army. You may have a small division or two but to build an army of loyal followers it is best to have respect for those who are giving up everything for your cause.
David's mighty men and the other warriors were loyal to David because he was loyal to them. There were things David did that proved to his followers he was loyal to them in return. Their allegiance was valuable to David. His allegiance to them produced undivided loyalty.
L is for loyalty.
1 Chronicles 12