put as much armour around you as you want, I'll still blow your *** up.[/b]
Para, your point is taken and is true to a point. The more armour the bigger the explosive has to be to blow it up. That requires more sophisticated attacks and the more difficult the attack the easier it is to defend against. When a single mine is stacked to get a big armour target you need more time to dig the hole you need a bigger hole and it is more obvious were the big hole is.
Best possible defence against attacks is aggressive, intelligent patrollinig. Gather info, isolate the enemy, then shoot him in the face.