Reaper-101-

Right i have a couple of questions regarding this mission and really the general structure in the campaign really. 1. Is there any way to push back the opposing army back to corazol or do u always fail that mission? 2. how do u stop them from entering the city? 3. if i do everything my squad leader tells me to then i will get a crap score. 4. is there any weapons in the crates that are like a sniper rifle apart from the mk13 right near the end! cheers in ur reply