The next day, in the morning, Samba delivered a large lump of iron, which was entrusted to Ugrasena for necessary action. Actually later on there was the foretold fratricidal war, and Samba died in that war
SB Canto 1
On hearing that the most dear Kṛṣṇa was approaching Dvārakādhāma, magnanimous Vasudeva, Akrūra, Ugrasena, Balarāma (the superhumanly powerful), Pradyumna, Cārudeṣṇa and Sāmba the son of Jāmbavatī, all extremely happy, abandoned resting, sitting and dining.
Vasudeva: Son of King Śūrasena, husband of Devakī and father of Lord Śrī Kṛṣṇa. He is the brother of Kuntī and father of Subhadrā. Subhadrā was married with her cousin Arjuna, and this system is still prevalent in some parts of India. Vasudeva was appointed minister of Ugrasena, and later on he married eight daughters of Ugrasena's brother Devaka. Devakī is only one of them. Kaṁsa was his brother-in-law, and Vasudeva accepted voluntary imprisonment by Kaṁsa on mutual agreement to deliver the eighth son of Devakī. This was foiled by the will of Kṛṣṇa. As maternal uncle of the Pāṇḍavas, he took active parts in the purificatory process of the Pāṇḍavas. He sent for the priest Kaśyapa at the Śataśṛṅga Parvata, and he executed the functions. When Kṛṣṇa appeared within the bars of Kaṁsa's prison house, He was transferred by Vasudeva to the house of Nanda Mahārāja, the foster father of Kṛṣṇa, at Gokula. Kṛṣṇa disappeared along with Baladeva prior to the disappearance of Vasudeva, and Arjuna (Vasudeva's nephew) undertook the charge of the funeral ceremony after Vasudeva's disappearance.
Akrūra: The commander in chief of the Vṛṣṇi dynasty and a great devotee of Lord Kṛṣṇa. Akrūra attained success in devotional service to the Lord by the one single process of offering prayers. He was the husband of Sūtanī, daughter of Ahūka. He supported Arjuna when Arjuna took Subhadrā forcibly away by the will of Kṛṣṇa. Both Kṛṣṇa and Akrūra went to see Arjuna after his successful kidnapping of Subhadrā. Both of them presented dowries to Arjuna after this incidence. Akrūra was present also when Abhimanyu, the son of Subhadrā, was married with Uttarā, mother of Mahārāja Parīkṣit. Ahūka, the father-in-law of Akrūra, was not on good terms with Akrūra. But both of them were devotees of the Lord.
Ugrasena: One of the powerful kings of the Vṛṣṇi dynasty and cousin of Mahārāja Kuntibhoja. His other name is Ahūka. His minister was Vasudeva, and his son was the powerful Kaṁsa. This Kaṁsa imprisoned his father and became the King of Mathurā. By the grace of Lord Kṛṣṇa and His brother, Lord Baladeva, Kaṁsa was killed, and Ugrasena was reinstalled on the throne. When Śālva attacked the city of Dvārakā, Ugrasena fought very valiantly and repulsed the enemy. Ugrasena inquired from Nāradajī about the divinity of Lord Kṛṣṇa. When the Yadu dynasty was to be vanquished, Ugrasena was entrusted with the iron lump produced from the womb of Sāmba. He cut the iron lump into pieces and then pasted it and mixed it up with the sea water on the coast of Dvārakā. After this, he ordered complete prohibition within the city of Dvārakā and the kingdom. He got salvation after his death.
Baladeva: He is the divine son of Vasudeva by his wife Rohiṇī. He is also known as Rohiṇī-nandana, the beloved son of Rohiṇī. He was also entrusted to Nanda Mahārāja along with His mother, Rohiṇī, when Vasudeva embraced imprisonment by mutual agreement with Kaṁsa. So Nanda Mahārāja is also the foster father of Baladeva along with Lord Kṛṣṇa. Lord Kṛṣṇa and Lord Baladeva were constant companions from Their very childhood, although They were stepbrothers. He is the plenary manifestation of the Supreme Personality of Godhead, and therefore He is as good and powerful as Lord Kṛṣṇa. He belongs to the viṣṇu-tattva (the principle of Godhead). He attended the svayaṁvara ceremony of Draupadī along with Śrī Kṛṣṇa. When Subhadrā was kidnapped by Arjuna by the organized plan of Śrī Kṛṣṇa, Baladeva was very angry with Arjuna and wanted to kill him at once. Śrī Kṛṣṇa, for the sake of His dear friend, fell at the feet of Lord Baladeva and implored Him not to be so angry. Śrī Baladeva was thus satisfied. Similarly, He was once very angry with the Kauravas, and He wanted to throw their whole city into the depths of the Yamunā. But the Kauravas satisfied Him by surrendering unto His divine lotus feet. He was actually the seventh son of Devakī prior to the birth of Lord Kṛṣṇa, but by the will of the Lord He was transferred to the womb of Rohiṇī to escape the wrath of Kaṁsa. His other name is therefore Saṅkarṣaṇa, who is also the plenary portion of Śrī Baladeva. Because He is as powerful as Lord Kṛṣṇa and can bestow spiritual power to the devotees, He is therefore known as Baladeva. In the Vedas also it is enjoined that no one can know the Supreme Lord without being favored by Baladeva. Bala means spiritual strength not physical. Some less intelligent persons interpret bala as the strength of the body. But no one can have spiritual realization by physical strength. Physical strength ends with the end of the physical body, but spiritual strength follows the spirit soul to the next transmigration, and therefore the strength obtained by Baladeva is never wasted. The strength is eternal, and thus Baladeva is the original spiritual master of all devotees.
Śrī Baladeva was also a class friend of Lord Śrī Kṛṣṇa as a student of Sāndīpani Muni. In His childhood He killed many asuras along with Śrī Kṛṣṇa, and specifically He killed the Dhenukāsura at Tālavana. During the Kurukṣetra battle, He remained neutral, and He tried His best not to bring about the fight. He was in favor of Duryodhana, but still He remained neutral. When there was a club-fight between Duryodhana and Bhīmasena, He was present on the spot. He was angry at Bhīmasena when the latter struck Duryodhana on the thigh or below the belt, and He wanted to retaliate the unfair action. Lord Śrī Kṛṣṇa saved Bhīma from His wrath. But He left the place at once, being disgusted at Bhīmasena, and after His departure Duryodhana fell to the ground to meet his death. The funeral ceremony of Abhimanyu, the son of Arjuna, was performed by Him, as He was the maternal uncle. It was impossible to be performed by any one of the Pāṇḍavas, who were all overwhelmed with grief. At the last stage, He departed from this world by producing a great white snake from His mouth, and thus He was carried by Śeṣanāga in the shape of a serpent.
Pradyumna: Incarnation of Kāmadeva or, according to others, incarnation of Sanat-kumāra, born as the son of the Personality of Godhead Lord Śrī Kṛṣṇa and Lakṣmīdevī Śrīmatī Rukmiṇī, the principal queen at Dvārakā. He was one of those who went to congratulate Arjuna upon his marrying Subhadrā. He was one of the great generals who fought with Śālva, and while fighting with him he became unconscious on the battlefield. His charioteer brought him back to the camp from the battlefield, and for this action he was very sorry and rebuked his charioteer. However, he fought again with Śālva and was victorious. He heard all about the different demigods from Nāradajī. He is one of the four plenary expansions of Lord Śrī Kṛṣṇa. He is the third one. He inquired from his father, Śrī Kṛṣṇa, about the glories of the brāhmaṇas. During the fratricidal war amongst the descendants of Yadu, he died at the hand of Bhoja, another king of the Vṛṣṇis. After his death, he was installed in his original position.
Cārudeṣṇa: Another son of Lord Śrī Kṛṣṇa and Rukmiṇīdevī. He was also present during the svayaṁvara ceremony of Draupadī. He was a great warrior like his brothers and father. He fought with Vivinidhaka and killed him in the fight.
Sāmba: One of the great heroes of the Yadu dynasty and the son of Lord Śrī Kṛṣṇa by His wife Jāmbavatī. He learned the military art of throwing arrows from Arjuna, and he became a member of parliament during the time of Mahārāja Yudhiṣṭhira. He was present during the Rājasūya-yajña of Mahārāja Yudhiṣṭhira. When all the Vṛṣṇis were assembled during the time of Prabhāsa-yajña, his glorious activities were narrated by Sātyaki before Lord Baladeva. He was also present along with his father, Lord Śrī Kṛṣṇa, during the Aśvamedha-yajña performed by Yudhiṣṭhira. He was presented before some ṛṣis falsely dressed as a pregnant woman by his brothers, and in fun he asked the ṛṣis what he was going to deliver. The ṛṣis replied that he would deliver a lump of iron, which would be the cause of fratricidal war in the family of Yadu. The next day, in the morning, Sāmba delivered a large lump of iron, which was entrusted to Ugrasena for necessary action. Actually later on there was the foretold fratricidal war, and Sāmba died in that war.
So all these sons of Lord Kṛṣṇa left their respective palaces and leaving aside all engagements, including lying down, sitting and dining, hastened toward their exalted father.