How did Sri Rama win the war?

Did Sri Rama win over Ravana, just because he was far superior to latter in strength /wisdom or because he had the support of  vast Vanara Army or due to the support extended by Vibhishana or because he was an incarnation of Lord Vishnu or the all powerful Sri Hanuma stood behind him or something else?

• Sri Rama was not an incarnation of Vishnu, as commonly believed.
• Sri Rama was able to defeat Ravana, due to his adherence to DHARMA.  

·        Whatever reasons one may quote, those are all secondary, but Why?

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Mareecha, who turned into Golden deer for diverting Sri Rama from hermitage so that Ravana can abduct  Sita, tries to advice Ravana, against abducting Sita,  by describing the characteristics of  Sri Rama.

कैकेय्याः प्रिय कामार्थम् पितुर् दशरथस्य च |
हित्वा राज्यम् च भोगान् च प्रविष्टो दण्डका वनम् || ३-३७-११

"Discarding the kingdom and even royal-comforts Rama entered Dandaka forest only to fulfil the cherish of Kaikeyi, viz., kingdom for her son Bharata, and even that of Dasharatha, viz., to remain loyal to his promise to Kaikeyi”. 

रामो विग्रहवान् धर्मः साधुः सत्य पराक्रमः |
राजा सर्वस्य लोकस्य देवानाम् इव वासवः || ३-३७-१३

"Rama is the embodiment of righteousness, he is an equable person with truthfulness as his valour, and as with Indra to all gods he is the king of entire world.”

(Sri Rama's principles alone make him victorious, as he does not deviate from the path of righteousness. And by not deviating from the path of righteousness, he is truly valorous and the question of his defeat does not arise, because he will abide by his conscience.)

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1)      Kabandha, after getting liberation from a curse, gives directions to Sri Rama for reaching Kishkinda and befriending Sugriva.

2)      Sugriva, after getting eliminated Vali with the help of Sri Rama, sends his vast Army in all directions,  in search of Sita and accompanies, along with his vast army, Sri Rama to Lanka for participating in the war with Demons.

One may argue that Kabandha and Sugriva might have helped Sri Rama out of  gratitude.

3)      Vibhishana, helps Sri Rama by disclosing the secrets of Ravana and Indrajit.  

One may explain that Vibhishana, out of greed for a great kingdom, helped Sri Rama.

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However, what about Sri Hanuma,  the Ocean God, , the mighty Garuda, who advised, supported  and helped Sri Rama?  

• Sri Hanuma himself had Supernatural powers. 
•   Sri Hanuma could conquer a part of Ravana’s army, singlehandedly, within no time.
• No DIVINE weapon can cause DEATH to him.( अशस्त्र वध्यताम्  - ४-६६-२७)
•  DEATH will come to him at his WISH only.( स्वच्छंदतः च मरणम्  - ४-६६-२९)
•  He was well versed in 3 Vedas (न अन् ऋग्वेद विनीतस्य  - ४-३-२८)
• Sita herself acknowledges that Sri Hanuma was an accomplisher of any task (त्वम् हि कार्यविदाम् वरः - ५-३९-२७)
•  Sita herself acknowledges Sri Hanuma’s immense strength (तव सत्त्वम् बलम्  -  ५-३७-४०)

Still Sri Hanuma did not expect anything from Sri Rama, but extended lot of service to the latter, but why?

It is just because of Sri Rama’s adherence to the DHARMA, and because he himself an adherent to DHARMA.

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Why did the Ocean God help Sri Rama, by advising the latter as to how to cross the great ocean?

The  Ocean God appears before Sri Rama, when the latter about to discharge the great Brahmastra against the former.  

The Ocean God explains that he cannot give way to Sri Rama and his army, because it is against the NATURE’s LAWS.

पृथिवी वायुर् आकाशम् आपो ज्योतिः च राघवः |
स्वभावे सौम्य तिष्ठन्ति शाश्वतम् मार्गम् आश्रिताः || २-२२-२५

"O, beloved Rama! Earth, wind ether, water and light remain fixed in their own nature, resorting to their eternal path."

तत् स्वभावो मम अपि एष यद् अगाधो अहम् अप्लवः |
विकारस् तु भवेद् राध एतत् ते प्रवदामि अहम् || २-२२-२६

"Therefore, I am fathomless and my nature is that it is impossible of being swum across. It becomes unnatural if I am shallow. I am telling you the following device to cross me."

However, he gives clue for constructing a bridge over him, which he assures that  will  not collapse till his army has crossed it.”

विधास्ये येन गन्तासि विषहिष्ये ह्यहम् तथा |
न ग्राहा विधमिष्यन्ति यावत्सेना तरिष्यति || २-२२-२८
हरीणाम् तरणे राम करिष्यामि यथास्थलम् |

"O, Rama! I shall make it possible to see that you are able to cross over. I will arrange a place for the monkeys to cross me and bear with it. As far as the army crosses me, the crocodiles will not be aggressive to them."

We have to understand the subtlety of the words spoken by the Ocean God.  He says that  “I will arrange a place for the monkeys to cross me and bear with it.”

He was talking not just about their ONWARD journey only, but also about RETURN journey also.  So the bridge will remain there till the Vanara army completes it RETURN journey also.

Again here also, the Ocean God helped Sri Rama, because he adhered to DHARMA, but not because he was afraid of Sri Rama’s Valour.

Sage Valmiki conveying his message that the ALL POWERFUL NATURE helps the righteous people.

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The mighty Garuda arrives in the battlefield and helps Sri Rama and Lakshmana in getting rid of sorcery of serpants  laid by Indrajit.

Again Garuda also helps Sri Rama, because the latter was adherent to DHARMA. 

(सभाग्यसः च असि धर्मज्न राम सत्य पराक्रम | - ६-५०-५०)