Today's Conundrum: Why the Dwivachan?

 Actually, this conundrum is not new. It has been troubling me since i started learning Sanskrit. 

As far as I know, most languages in the world have 2 states -Singular, and Plural (Ekvachan- Bahuvachan)

Sanskrit is the only language where there are 3 states - 1, two, and more than 2 (Ekvachan, Dwivachan, Bahuvachan)

None of the derivative languages of Sanskrit have inherited this unique trait of Sanskrit, not even Hindi, which is grammatically closest to Sanskrit.

We have not found this (in as much as we know) in Prakrit or Pali either.

The Dwivachan is so important that for every word, every verb, there is a Dwivachan defined. - Akarant, Ikarant, Ukarant, Pulling, Stiling, Napunsakling, Dhatu Roop - everything.

That meant significant work for Panini and his team.

WHY was the count of 2 so important?

I think that the day we solve this puzzle, we will answer some very important questions about Indian history.

Kshanika

सारे जीवन का सार,
ये प्रेम.

या

शाश्वत प्रेम की कमाई
यह शांत जीवन.

?

Translation:

Is joyful love
the result of a life well lived

Or a life well lived
the result of spreading universal love?

Questions to Ponder over..

So, while watching Panipat(the movie) today, I had a doubt. Of the holy Trinity of Hinduism, Vishnu has taken the forms to fight most often - Ram is a warrior prince, Parashurama, Varaha, Narsimha, etc. Yet, the battle cry is "Har Har Mahadeva" - invoking the power of Shiva in everyone.

To the best of my knowledge, Shiva fights very well, but is, at heart, a Yogi.

So, why do the war cries not invoke Vishnu or any avatar of Vishnu? and more importantly, why do they invoke the power of Mahadev?

Anyone who knows and would like to enlighten please? I will be hajaar grateful.

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Question number 2:

Mahabharata, the greatest battle in our mythology, happened in Kurukshetra.

3 successive battles were held in Panipat, barely 60 kms away.

As probability goes, the odds of 4 historic battles happening so close to each other are pretty.. abysmal.
What is it about Panipat?
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Question no 3:

What is the origin of the name Panipat?