What is the easiest way to get passed all 50 waves on gears of war 2

Its easy.First get 5 people including you on your team.Second put the difficulty on casual.Third if you have the map packs,the best places in my opinion are nowhere,grind yard,under hill,possibly gold rush,possibly highway,and blood drive.lastly,get a good spot to camp at whenever it gets really hardcore around 29-48