Well, of course you have to line up "square" to get assured pene . . . . Oh, you're talking about tanks. :)
Well, in every mission, you first you have to conduct a careful reconnaissance to pin-point the objective--many an operation has failed by aiming for the wrong target! Prepping the objective is important as well--unless you soften the objective area up a little, you may never even get close--nowhere near the range of your organic weapon! Even then, unless you use everything you have to set the conditions in and around the objective area, a veteran adversary will see through your every move and have a counter-measure ready.
It normally takes lots of patience and a heavy commitment of resources to win through to the objective. Sometimes the only way to achive success on your mission is to make the ultimate sacrifice--which I was required to do 24 years ago.