The history contained in 1 Samuel is divided mainly into the lives of four men - of necessity there is much overlapping.
Eli the penultimate judge, was an easy-going, even considerate man, as events will prove. But he was proven to be weak-willed, allowing wicked practices that made it necessary for him to be removed. The special circumstances of Samuel's birth are used by God to
produce a usable leader who would be Eli's successor.
Elkanah is introduced as having two wives (1 Samuel 1:1-2 ). Though polygamy was tolerated under the law of Moses (Deuteronomy 21:15-17 ), it was not the divine intention - see the specific teaching of our Lord (Matthew 19:3-8 ). Polygamy is
shown in the Scriptures to cause great tensions and untold misery. Hannah was far from a happy woman. She had to endure provocation from her rival owing to her barrenness which was accounted as a great disgrace for a Hebrew woman. God, in grace, chose to
use this unhappy, barren, but godly woman to give a leader to Israel in a moment of great crisis.
We can learn from her to yearn for fruitfulness and by development of God's graces in us we will be:
(Read also 2 Peter 1:3-8 ).
Notice the prayer that birthed God's usable leader.
Eli observed from where he sat (1 Samuel 1:9 ), and misunderstood, and thought her to be drunk (1 Samuel 1:12 ). Such was her physical earnestness. Holy Spirit utterance was mistaken for drunkenness at Pentecost (Acts 2:13-15 ), and Ephesians
5:18 exhorts not to be drunk with wine, but instead to be filled with the Spirit.
It contained willingness to sacrifice to God's purpose. Not just as a Nazirite, but to the Lord, "all the days of his life" (1 Samuel 1:11 ). It contained willingness to forgo all parental rights (1 Samuel 1:11 ). Later Elkanah stood with her in keeping her commitment
as she did fully what she had promised (1 Samuel 1:21-28 ). It centred on God's mighty power. "O LORD of hosts" (1 Samuel 1:11 ). One who commands the angelic armies, who is the sovereign omnipotent God - with whom nothing is impossible.
Upon explanation by Hannah, Eli answered,
With such support even her face was changed. It contained earnestness, reverence and childlike faith. "... look on ..." your "... handmaid ..." "... give ..." (1 Samuel 1:11 KJV).
1. WEAK-WILLED ELI - THE JUDGE AND PRIEST (1
Samuel 1:1 to 6:21)
1.1. PRAYER BIRTHS A USABLE LEADER (1 Samuel 1:1-28)

God worked in a sorrowful spirit (1 Samuel 1:15 ). 
God worked in a soul afflicted (1 Samuel 1:16 ). 
God worked in a sensitive person (1 Samuel 1:17 ).
2 Peter 1:8 "... neither be barren nor unfruitful in the knowledge of our Lord Jesus Christ."
1.1.1. GOD WORKED IN A WOMAN OF PASSIONATE PRAYER
1 Samuel 1:10 "... prayed to the Lord and wept in anguish."
1.1.2. GOD WORKED IN A WOMAN OF PARTICULAR PROMISE
1 Samuel 1:11 "And she vowed a vow, and said, O LORD of hosts, ... I will give him unto the LORD all the days of his life, ..."
1.1.3. GOD WORKED IN A WOMAN OF PEACEFUL BELIEVING
1 Samuel 1:17 "Then Eli answered and said, 'Go in peace, and the God of Israel grant your petition which you have asked of Him.'"
1 Samuel 1:18 "... So the woman went her way and ate, and her face was no longer sad."