I'm on the Arctic level, and I can't figure out how to blow up the buildings which don't have the ammo dump around them. I tried following the manual, but I can't seem to throw grenades! Any help would be appreciated! Thanks!

Pickup the ammo stash and you get (i think) 5 grenades. To throw them, hold down the RMButton and click the LMButton. To fire Rockets later, make sure they are selected on the team list on the left, and use them the same way as nades.

Thank you very much!

What ammo stash ?

They're the brown wooden boxes you'll occasionally see. You just walk straight into them to pick them up, but gunfire blows them up.

You can see in this longplay video

Thanks. I thought the boxes' purpose was to simply destroy buildings, like in C&C Red Alert.