Kappa weren't helping in the end as well. Doing it aggressive way helped - mining the road and using the cannon in damaged vehicle. Now it's probably going to be almost equally high number, because I got this mission at day, so I always got spotted by one of the two apcs patrolling the area or the other guys.
First time did it at night without NVG and it took me above some 100 returns until I realized the only way is to blindly run into the cistern area and clean it by myself - the only way not to being threatened in the open field and losing any men (and actually see something).
