As can be seen in many stone reliefs and hero stones, it is known that forward curves 'knives' in earlier times were used in Deccan/south India.
It is hard to say how long they were, but it seems as if they were shorter than the swords used at the time.
Why they 'moved' to the north is hard to say, but it could be, as I read somewhere, that a population was driven away, and went to the north, bringing their weapos and culture with them.
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