I was doing it on Normal, I don't think difficulty effects credits. Also used Cowbell skull but I don't think that would help either so doesn't really matter. I tried right side after I posted and I think left was a bit faster personally, but it might just be because I was used to it. What I did was just pass over the bridge, shoot at the enemies on the floor then immediately turn around and kill the enemies on the bridge, that way it gets you a huge multikill (got a killionaire at one point when I nailed all the ground enemies), then take out the next set of enemies and revert straight after. Each run takes a minute at most. The credits rack up pretty quickly from the multikills. Also gives points towards a lot of commendations. Heavy Weapons, Multikills, Infantry Kills, Leader Kills, etc. I hit gold rank for the heavy weapon commendation and that gave another 2k credits.
Edit: After trying a ton of random different ways, both my own hunches and other people saying BEST WAY TO FARM CREDITS. Gruntpocalypse in Score Attack matchmaking seems like the fastest. You get over 1k easily and takes anywhere from 5-8 minutes depending on map/fluff ups.
Edit edit: Alright what motherfucker thought 66k to go from Warrant Officer 3 to Captain was a good idea?
XI Wiki



