Because Kurukshetra was in between Hastinapur and Indraprasth and easily reachable from both ends.
Kurukshetra War happened in -6000.
Kurukshetra
KrukshetraANS 2 - The Mahabharata is an epic Sanskrit poem that describes, among other things a war between two groups of cousins at Kurukshetra, in the modern state of Haryana in India. This war allegedly happened about 6,000 BC
Bheema had faced with the Duryodhana in kurukshetra war..
Its period was 18days.
18 days
Drishtadyumn
The great battle of Kurukshetra fought between Pandavas and Kauravas.
18 days!!
Yuyutsu
Sanjay
French and Indian war and the revolutionary war