When the two parties first catch sight of one another, having been expecting far worse enemies, they are so relieved that they all throw down their weapons and declare a truce. Together, they make introductions, chat, set up shelter and so on. After a few days, however, supplies begin running low, all avenues of escape have been exhausted, and it becomes obvious that whatever sick bastard forced them into this situation isn't letting anyone go until they've seen some carnage. Tensions rise. Arguments break out, factions form, lines are drawn in the sand. Shadows move in the darkness. The night air is rent by screams and incongruous giggling. When dawn breaks, the only survivor is Chiyo-chan gripping a bloodstained palette knife, hugging her knees and rocking back and forth, whispering under her breath "tsukurimashou, tsukurimashou..."

An adult tyrannosaurus rex vs a T-26 tank.