Yeah damn straight, I got stuck on Croatia too so I searched the net for strategy guides in frustration. This stage is a monster, even the southeast enemy camp is a pain in the ass, just saving enough pennies to get air transport to get a lift to the high ground to launch an assault sucked.
This will help: http://au.gamespot.com/features/6168146/p-9.html
Howie's right, get those riflemen dug in to the south west and north of your base ASAP, and I built anti tank turrets to the east of the base.
And Mammoth tanks, LOL how freaking cool are those things. If you have four or more them them you're practically invincible, I Love the Sly Stallone voices they put out.