But yeah, it is a bit difficult. The problem in the beta-version is that there are too many soldiers (that will run all over the map). The solution is to delete some. This will make the mission easier. And I will make the player in the west who attacks your ally train recruts later, so that we have some more time to build.
Say not that I haven't said that it would be difficult! It's the last mission of the campaign, so it must be difficult.
Don't worry about your English, it is most understandible (<-- if that is a word :S).
P.s.: I have now improved mission 1 - 11, so it won't take long until I arrive at mission 16.