Valkyria Revolution

found a infinity enemy spawn point pretty early in the game :)
i came to this free battle mission(defend temir road) in chapter 2 for the first time and when you ran all the way left to the red line aka invisibel wall right befor you would go down to the enemy base there is a spawn point for 5 enemys.
this 5 enemys will spawn infinity if you dont capture the base down hill.so set your squad to solo with lb and start killing this guys until you have 3000.
you should be abel to kill this enemys in under 10 secounds so it should take around 1 1/2 hours to hit the 3000 kills.you could also stand yourself right to the red line and let your sqaud do all the work while you watch a movie or something but this will take longer... depens on how smart you squad is xD

http://xboxdvr.com/gamer/Th%20v4n%20Heising/video/33501097


edit:im in post game now with 60+ hour in game time and can say if you going for the 100% in this game there is no need to grind this early.you kill easy 3000 enemys just the normal playing way becuase you have to grind a lot.dont now how much enemys i killed with that much in game time cause the xbox kill counter stops at 9999 kills but i gues somewhere between 15-20k easy.