I was stuck in artifact retrieval 101 until I bought the Holy Grail. It kills most non-shielded enemies with one shot! It also got a decent range. If you are having any problem with the mission, you should check it out.
Attention all newbies,MnB is Probably one of the best strategy games in the net, but it's too complicated for you guys. you have to see the MnB wiki in the intelligence menu. It requires strategy to reach 100th wave. it's unfairness makes the game even more interesting. you have to change your strategies after every major brutalities. How this game would've been better if you wouldn't lose any soldiers? But I am still giving a tip to the newbies who are too lazy to read the wiki. To avoid the strikes you have to keep your squad number at 6 or less. If you want more (Of course you want more!) you should build a camnet and put all your extra troops under that to hide them (They are still visible to the enemies in the field). If you have more than 6 units outside the net enemy might send strikes at you. Give the game some time and you will understand it. It truly deserves 5/5. Veterans should rate the comment up.