As far as I can tell the Pandava brothers wanted to go as far away from Hastinapura as possible. They ended up thirsty in the forest but drank from the cool water of Ganga, which was flowing nearby.
The Mahabharata offers one of the first instances of theorizing about "just war", illustrating many of the standards that would be debated later across the world. In the story, one of five brothers asks if the suffering caused by war can ever be justified. A long discussion ensues between the siblings, establishing criteria like proportionality (chariots cannot attack cavalry, only other chariots; no attacking people in distress), just means (no poisoned or barbed arrows), just cause (no attacking out of rage), and fair treatment of captives and the wounded.
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