Who were the top 10 strongest warriors of Treta Yuga?

 10# Vali :

• Vali was strongest Vanara after Hanumana ji.
• Vali once defeated Ravana in physical bout.
• Vali killed a buffalo demon named Dundubhi in a fierce battle and lifted Dundubhi's gigantic corpse and threw it hundred yojanas away.
• Vali also killed Dundubhi's brother Maayaavi including all of his relatives after a fierce battle in a cave near his Kishkindha Kingdom.
• When Sugreeva came to fight him, he thrashed Sugreeva effortlessly.

9# Kumbhakarna :

• Kumbhkarna was strong even without any boon.
• Kumbhkarna defeated Indra, the eleven rudras and all the devas in Swaraga.
• Kumbhkarna had pulled Airavat’s tusk and struck it on Indra’s chest.
• Indra’s Vajra could do no harm to Kumbhakarna.
• Devas , Brahmarishis and Rakshashas feared Kumbhakarna.
• Kumbhakarna even injured Hanuman.
• Kumbhakarna defeated many Vanara cheifs and captured Sugriva.
• Kumbhakarna literally ate 7,8,10,20,30,etc., Vanaras at a time.

8# Atikaya :

• Atikaya was known for his counselling , horse-riding and elephant-riding skills , swordsmanship , archery , strategies of dissention among enemies through bribes and leading the army.
• Atikaya defeated Devas , Rakshashas and Yakshas many times and defended his people .
• Atikay neutralized the vajra of Indra with his normal arrows. He also countered noose of Varuna.
• Atikay effortlessly defeated 5 Vanara chiefs name Mainda, Dvivida, Sharabha, Nila and Kumuda.

7# Indrajita :

• Mēghanāda a.k.a Indrajita like his father was a very powerful warrior and second strongest warrior of the Rākṣasas. One can say he is a true prodigy.
• He perfomed a great Yajña known as Mahēśvara Yajña and got a rare boon from Rudra (probably his Māyā as the text does not mention what the rare boon was).
• Though Rāvaṇa and Kumbhakarṇa defeated Indra, Mēghanāda was the only one to successfully capture him. Mēghanāda also was very skilled in using Māyā.
• It is also stated that he defeated the Rudras, Vasus and Ādityas also.
• He killerd 63 crore Vānaras with the Brahmāstra and killed many Vāranas using his serpents.
• He through his boons captured Hanumana , and knocked Rama and Lakshman.
• Mēghanāda’s greatest advantage and disadvantage was his Nikumbila ritual. The one who disturbs it would cause his death.

6# Kartiveerya Arjuna :

• Kartiveerya Arjuna was an extremely strong warrior.
• Kartiveerya Arjuna earned his boons through his merit.
• Kartiveerya Arjuna got thousand arms and stopped the flow of rivers and oceans.
• Kartiveerya Arjuna conquered whole earth.
• Kartiveerya Arjuna defeated Indra .
• Kartiveerya Arjuna defeated a young Rāvaṇa.

5# Lakshmana :

• Lakshman was the right hand of Bhagwan Sri Ram.
• Lakshman was greater archer than Kartiveerya Arjuna.
• Lakshman helped Sri Ram defeating Viradha and Kabandha.
• Lakshman could destroy whole Rakshasha clan through his Brahmastra.
• Lakshman easily defeated Surpanakha .
• Lakshman was so fearsome that when he arrived in Kishkinda to confront Sugriva , that all Vanaras started running away from him.
• Rama and Lakshmana together wiped out 1/3rd army of rakhasas on day one completely at night time .
• Lakshmana stalemate Kumbhkarna.
• Lakshmana defeated Indrajita .
• Lakshman killed Rakshashas Indrajita , Atikaya and Virupaksha.

4# Bhargava Parshuram :

• Parshuramaji is one of the greatest warriors of Sanatan Dharma.
• Parshuramaji is an Amsha avatar of Sri Hari Vishnu himself.
• Bhargava Ram was trained by none other than Devo ke Dev Mahadev.
• He fought a duel with Mahadev himself and even scratches Bhagwan Shiva in forehead.
• In the form of Gurudakshina to Mahadeva , he destroyed many Daityas that were against Indra .
• Parshuramaji had devine Parshu of Mahadeva .
• Parshuram killed a tiger easily to save a boy Akritverma , who became his most devoted follower .
• Parshuram killed 100 Akshouhinis of Kartiveerya Arjuna.
• Parshuramaji cut down each arm of Sahastrabahu Arjuna .
• As per Mahabharata, he killed Kartiveerya Arjuna through his Parshu while as Brahmananda Puran he killed him through Pashupastra.
• He killed 100 sons of Kartiveerya Arjuna.
• He destroyed evil Kshatriyas 21 times and conquered whole earth . He donated the Earth to Rishi Kashyap.
• He through his Vishnu Teja saved the world from Brahmastra.
• The only warrior who could properly defeat him was Maryada Purushottam Prabhu Sri Ram.
• After being defeated by Kaushalyanandan's Vaishnavastra , Renukanandan transferred his Teja to him and blessed him with Saranga bow .
• His student list is incredible : Akritverma, Pravara, Mahamahim Bhishma, Dronacharya, Radheya Karna , Rukmi , Malaydhwaja Pandya. He is also going to train Kalki ji.
• As per Shiva Dhanurveda, Parshuramaji is foremost of Gurus .
• In his battle against Bhishma Pitahmah, he literally fired , thousands, then millions, then billions , and at last literally trillions of arrows.
• At the last days of his battle against Bhisma ji , Jagdamanya Ram was dominating the fight .
• Bhishma Pitahmah not knowing how to defeat Parshuramaji, prayed to devas and through Devas , he got Prashwapna astra , with which he could finally prevail over Bhargava Ram .

3# Ravana :

• Rāvaṇa has a lot of achivements some which are positive and others which are negative.
• Rāvaṇa conquered the Nāgas in a battle.
• Kubera ,the Lord of Yakṣas, accompanied with 60,000 warriors, was subdued by the might of Rāvaṇa and also stole his Puṣpaka Vimāna.
• Rāvaṇa killed his own brother-in-law Madhu, Kumbhīnasa's husband, another ruler of demons, in a duel.
• Rāvaṇa conquered and captured Takṣaka, Śankha, and Jaṭī when he conquered the Rasatala.
• Rāvaṇa subdued the Nivātakavacas after a year of battle. He was unable to kill them due to their boon.
• Rāvaṇa also defeated the sons of Varuṇa in a battle.
• Rāvaṇa also defeated Yama and his forces in a battle.
• Rāvaṇa also killed many Kṣatriyas including Rāma's ancestor Anāraṇya.
• Indra and the Dévas together were unable to subdue Rāvaṇa in a battle.
• Rāvaṇa lifted Kailāśa with Lord Śiva sitting on top. He killed those who were arrogant and shook the entire universe.
• Rāvaṇa had conquered all three worlds .
• Rāvaṇa also killed Jatayu.
• Rāvaṇa was physically powerful enough to have ability to lift Mountains such as Meru , Mandara and Himalaya , lift three lokas with Devas and exhaust Hanumana in physical duel.
• Rāvaṇa defeated Lakshman ji twice , once when Lakshmana fought him together with Vibhishana.
• Rāvaṇa defeated each Vanara general Sugriva . Jambavat , Nila etc., with the sole exception of Hanuman.
• Rāvaṇa through his Tamasastra killed crores of Vanaras.
• Rāvaṇa did most damage to Sri Rama’s army.

2# Hanumana :

• Hanuman ji was extremely powerful warrior in ramayana. Perhaps physically he was most powerful warrior in Ramayana.
• He was son of Vayu as per Valmiki Ramayan and Valmiki Ramayan addresses him only as Son of Vayu.
• Survived the Vajra of indra in childhood and traveled nearly 300 yojanaa towards sun.
• Was blessed With a boon of indestructibility by any divine missile by Brahma. Indra and Rama gave him boon of immortality.
• Killed the sea demoness Simhika.
• Conquered the city of Lanka which was herself in form of demoness.
• Killed the 80,000 Kinkara demons in the Lanka with iron rod.
• Killed Jambumali and 7 sons of Prahasta as well as several generals of Lanka.
• Killed son of Ravana Akshaya Kumar.
• Survived Infallible Brahmastra of Meghnad twice.
• Burnt the city of Lanka.
• Killed several demons like Dhumrakasha, Akampana, Devantaka, Trishira,Nikumbha and many others.
• Brought Sanjeevani Herbs twice;once healed whole vanara army and Rama and lakshman and second time for Lakshman.
• Defeated Ravana with a blow of his fist. It was so strong that ravana had blood coming out of his mouth and swooned.

1# Sri Rama :

• No one in the entire epics has ever fought fiercely like Sri Rama .
• In his youth , Sri Rama killed demons such a Tadaka , Subahu and his other warriors and defeated Maricha .
• Easily broke the Shiva Dhanusha to win Maa Sita and defeated Bhargava Parshurama.
• Killed Rakshasas like Viradha , Kabandha and Maricha .
• He destroyed 14000 rakshashas including Khara and Dushana, single handedly.When Rama was fighting, rakshasha could not even see Sri Rama, because of his swiftness in martial arts. So swift was Rama in fighting skill, that rakshhasha were confused and started to kill one another.One Rama appeared to be 1000, when rakshasha saw him because of his swiftness of killing. One moment they see Rama, one moment they get killed, such was their condition.
• When Indra’s son Jayanta(in crow form) in lust was pecking on Mata Sita,seeing his dear wife in pain Lord Rama threw the grass blade to Jayanta, turning it to Brahmastra.
• Such momentum he had, such force he had, that through one arrow he was able to tear 7 sal trees apart. Also tossed around Dundubhi’s corpse through his toe and fairly killed Vali.
• Sri Rama’s arrow made ocean tremble.
• Shri Rama defeated Ravana during their 1st encounter and spared his life.
• Rama and Lakshmana together wiped out 1/3rd army of rakhasas on day one completely at night time .
• Sri Rama singlehandedly killed ten thousand chariot warriors, eighteen thousand elephants, fourteen thousand horses and two lakhs foot soliders, in span of 3 hours.
• Sri Ram killed nearly invincible Rakshashas Ravana, Kumbhakarana and Makrasksha.

Jai Sri Rama .

If Ramayana belongs to Treta Yuga and Mahabharata belongs to Dwapara Yuga, what happened in Satya Yuga?

 MANY THINGS HAPPENED IN THE SATYA YUG (ALSO KNOWN AS KRITA YUG)

1. SAMUDRA MANTHAN

The gods lost all their power and vitality after a curse by the sage Durvasa. To regain their strength and immortality, they sought Lord Vishnu's help. He advised them that the only way to obtain the Amrita was to churn the great cosmic Ocean of Milk (Kshirasagara).

2. DEATH OF HIRANYAKSHIPU AND HIS BROTHER

Shri Vishnu took the Narsimha avatar and varaha avatar to kill two powerful Asuras - Hiranyaksha and Hiranyakshipu, who terrorized the gods and were incredibly strong due to the vardaans given to them by Brahma.

3. THE TARAKMAYA WAR

This war / Yudh happened after the kidnapping of Brihaspati’s wife Tara by the Moon God Soma.

4. MATSYA AVATAR

Lord Vishnu incarnated as a fish to save Manu (King Satyavrata) from a great deluge (flood) and preserve the Vedas and all species for the next cycle of creation.

If Ramayana belongs to Treta Yuga and Mahabharata belongs to Dwapara Yuga, what happened in Satya Yuga?

 The greatest war happened in Satya yuga and arguably, most devastating war. It was the Tarakamaya war, Ramayana and Mahabharata pales in comparison to this.

The conflict occured after Soma abducted Tara, wife of Brihaspati. Despite the devas requesting him to return her, Soma did not relent, Gods headed by Shiva, Vishnu and Indra launched an assault on Soma who was assisted by Shukracharya(due to enmity with Brihaspati) and his demon hordes.

As per puranas, in this battle, Vishnu killed a demon named Kalanemi as well as several others, whilst Shiva hurled Brahmashira against demons. , Shukracharya was the main adversary of Siva in this battle.

The war went for a long time with either side undefeated,. A group of devas requested Brahma to put an end to it. Brahma's intervention concluded the war and Tara was restored to Brihaspati.

He disregarded the sons of Aṅgiras and suddenly abducted the renowned wife of Bṛhaspati named Tārā.

30. Even after being requested by the Devas and divine sages, he never let-off Tārā to Bṛhaspati, the son of Aṅgiras.

31-33. Uśanas took up his (Soma’s) side and Bhava (Śiva) that of Aṅgiras (i.e. Bṛhaspati), for that person of great brilliance was the disciple of the father of Bṛhaspati formerly. It was out of this affection that lord Rudra became the ally of Bṛhaspati and took the bow Ajagava.

A great miraculous missile named Brahmaśiras was discharged by that noble-souled one after aiming at the Devas, whereby their reputation was destroyed.

34. There a well-known battle between the Devas and Dānavas took place. It was known as Tārakāmaya[2] (concerning Tārā). It was destructive of the worlds.

35. The Devas who survived this battle are remembered as Tuṣitas. They sought refuge in god Brahmā, the primordial lord, the grandfather of the world.

36. Then the grandfather (i.e. Brahmā) himself came there and prevented Uśanas and Rudra, from fighting. He restored Tārā to Aṅgiras (Bṛhaspati).

~Brahmanda Purana.

O dear one, formerly Bṛhaspati’s glorious wife named Tārā was forcibly kidnapped by the powerful Candra (i.e. the Moon). Kidnapping Bṛhaspati’s wife the Moon took her to his house and dallied with her for a long time. O dear one, after some time she conceived. Then Bṛhaspati appealed (to Candra to return) his wife. Candra too, overcome by pride and puffed up by his power, did not give her (back). Then, O dear one, Bṛhaspati, getting ready along with gods like Indra, started fighting with the powerful Candra. To help Candra Śukra then came there to the battle that was commenced with the demons. Then a great war for Tārā took place. All people will look upon (that battle called) Tārakāmaya as important. In that very terrible war (both) gods and demons were killed. O dear one, no one was victorious or defeated. Then Brahmā came there, and stopping that fierce battle, gave, after admonishing the Moon, Tārā to Bṛhaspati. Bṛhaspati, seeing Tārā to be pregnant, was angry, and in the presence of Brahmā (said to) Tārā in the gathering of the gods and demons.

~ Padma Purana

Having disregarded Vrihaspati, the son of Angiras, the moon by force carried away his illustrious wife Tara.

31. And albeit solicited by the gods and Rishis he did not return her. Vrihaspati, the the preceptor of the gods, was accordingly enraged with him.

32-33. Ushana (Suka) began to protect his sides. The illustrious deity Rudra was formerly a disciple of Vrihaspati’s father. Out of reverence for him he (Rudra) protected his rear, taking his Ajagava bow in his hands.

34-35. A terrible battle, destructive of the gods and demons on account of Tara, was fought at the place where the high-souled Siva discharged his mighty weapon Brahmasiras—for the destruction of the demons and where their glory was (accordingly) destroyed.

36. O descendant of Bharata, in that battle the gods, well read in the precepts of religion who had sided Vrishaspati, and the deities Tushitas, who belonged to Soma’s party who had stolen away his preceptor’s wife, sought refuge with the Prime Deity the Eternal Brahma.

37. Thereupon the Grand-father himself came there, prevented Sukra and Sankara (to fight) and gave back Tara to Vrihaspati.

~Harivamsa purana.

It's not given in detail in Mahabharata, only parts of it are mentioned.

Indeed, it was upon that car that Indra and Vishnu had fought of old in the battle (with the Asuras) in which Taraka (the wife of Vrihaspati) had become the immediate cause of much slaughter.

..

I put this armour on thy body, joining its pieces with the aid of Brahma strings. In days of yore, Brahma himself had thus put it on Vishnu in battle. Even as Brahma himself had put this celestial armour on Sakra in the battle caused by the abduction of Taraka.