I Chronicles 11-12  These chapters give us the names of David's mighty men and the backgrounds of his army.  All of Israel came together to make David the king.  They acknowledged that the Lord had chosen David and they came in agreement.  David "made a covenant with them in Hebron before the Lord;" 

David's mighty men were each proven warriors.  There were 3 that were considered the first rank. Eleazar the son of Dodo was one of those, along with Jashobeam and Shaman.  Joab was the commander in chief.  All of them were famous for their feats in battle. 12:1 " Now these are the ones who came to David at Ziklag, while he was still restricted because of Saul, the son of Kish; and they were among the mighty men who helped him in war."

Here again we learn how God brought different groups together, each with special abilities, to bring David into the position of kingship according to the Word of the Lord.
The relatives of Saul, from the tribe of Benjamin could shoot bows with either hand and sling stones also.
The Gadites were " mighty men of valor, men trained for war, who could handle shield and spear, and whose faces were like the faces of lions, and they were swift as the gazelles on the mountains."  There captains are described like this, " he who was the least was equal to a hundred and the greatest to a thousand."
Manasseh's men were "all mighty men of valor".  18,000 "who were designated by name" came to David to make him king. (v31)
From Zebulan, Naphtali,  Asher and Dan, came thousands of men who could "draw up in battle formation".
From the 3 tribes on the east of the Jordan, Reubenites, Gadites, and Manasseh, came "120,000 with all kinds of weapons of war for the battle." 

"All these, being men of war, who could draw up in battle formation, came to Hebron with a perfect heart, to make David king over all Israel; and all the rest also of Israel were of one mind to make David king."  (v38)

V40 "... There was joy indeed in Israel."

The writer of Chronicles is looking back and telling the story of Israel's history. The greatest season in Israel's past, after the Exodus and the time of Joshua when they entered the Promised Land, was the time of David's reign. Finally Israel was where they were supposed to be with a good king and a united kingdom.  For the moment, there was joy.

Truth - God directed every part of this era in Israel's history.  He brought together some of the most amazing men, putting in their hearts the desire to serve in David's army.  Yet the most important thing about David's throne is the One Who came to rule for eternity.  Nothing that David did, no victory that was given to him, no land that he conquered stayed the same after he died. Nothing else mattered except the promise that his descendent would come to sit on that throne for eternity.  We still await the day when we see Jesus Christ come again to rule on earth and fulfill all of the promises given to David.

Father in heaven,  we give You honor and praise, blessing Your holy Name, for You are faithful and true. May Your Kingdom come and Your will be done on earth as it is in heaven.  O come, O come, Emmanuel!  May there be joy indeed in all the earth!  We long for You Lord.  Thank You for all that You have blessed us with this day. We look to You for every need. Give us our daily bread. Grant us forgiveness. Deliver us from evil.  Be glorified in all the earth we pray. Amen.