What happens when one side starts to win alot?

[skin]

smaller area = more defense;
more defense = higher percentage of soldiers being hit due to such close quarters (think: what would an artillerary shell do to a well spaced group of soldiers, as opposed to many sitting near the same tree);

vehicles:
smaller area = less bases;
less bases = smaller ammount of vehicles avaliable;
less bases = more bases in enemy hands;
more bases in enemy hands = more vehicles avaliable;
vehicles do not run off a fuel = no need to turn back;
no need to turn back = continued attack time;
continued attack time = more damage to defending fortifications and soldiers;

...and i could go on and on only to simply stress the point that the deciding battles will be held at the very beginning of the war. all who decide to show up late, will indeed miss a good share of the chance to affect the outcome of the entire planet.