i guess in world war 1 and 2 britain and to an extent russia were fighting on french/german soil for the people and not to own the land (apart from russia i guess)
I would say that still counts as fighting for land, as one of the big reasons we fought on french/german soil (among other places) was to stop the national socialist's who wanted our land, same as the Russians.
We weren't fighting for new land (although technically got it in the shape of West Germany/Berlin), but to keep our own.
But yeah, it was also about defending our allies too.