Obviously supply lines become an issue with any deep thrust. If you cannot sustain those supply lines, you are screwed. Lack of combined arms coordination is a huge part in this. Lack of ability with follow-on fire support. Lack of ability to meet objectives on-time brings to mind Operation Market Garden. One might have to go all the way back to Hannibal to fully understand this. Regardless, stalemate sets in...and the advantage goes to the home team — provided that they have the willingness to sustain civilian casualties (which they probably do). It is interesting to note that Richard Nixon foresaw this in 1993/94 period of time. He predicted it would be bloodier than Bosnia.