Our channel started when a buddy (BATTLE__BEAST) and myself (Poseidonh2o) noticed that neither one of our own channels were growing with our World of Tanks videos, so we decided that we could get more attention if we combined our efforts on the same channel. The first few months were slow, we only managed to get 5 videos uploaded but we had okay views even though one was a time sensitive video (it was for a mod pack that wouldn't work after WoT updated and they did soon after our video went up) that plateaued pretty quickly and stopped gaining views. That gained us about 11 subs, I think with our next video, we made it up to 15 but then we didn't do anything for almost six months and we gained a sub every now and then, but the views slowed and I think in that time we maybe got to 20 subs. That's about to be expected for the amount of work we did however.
In July 2015 I started doing 3 videos a week, and we grew from around 25-30 subs to 108 by the end of June 2016 without doing anything but making videos, no promotion, no social media (other then the automatic twitter update you can do from YouTube) and we were pretty happy with that, but now we're taking it more seriously and since then our growth has us at 196 subs (though I think we might have that glitch, every time we get to 197, the next day we're back down after uploading) so we've had a bit of an odd journey, but it has taught us a lot and even though our subs aren't as high as they could be, our views have always been pretty good when we actually upload, so we've never been too worried about it.