alphaomega

Hiya guys kinda new to this but I am on a level where I have to secure a base and the only way to get to the bridge from the starting point I am at is to the left of me there is a van to the left and something that looks like a camoflage net above it and cars to the left of the camo net object I tried lobbing a grenade but the damn thing just sat there it wouldnt blow up I tried to get my people to attack it but they wouldnt ? I can post a picture of the obstruction if that is needed but I would ask that you instruct me on how to add a picture. Thanks in advance guys.