So I was playing against some friends the Other day ( 2000 pts game, they had orcs and wood elves at 1000 each) and I had 2 rocket batteries and a mortar ( never play them so ... Why not I thought). To my great satisfaction, they deployed all of there troops on one side and they tried the "refused flank tactic". But, the orc player deployed a line of 20 goblin archers in front of his 2 regiments with general and great banner, his chariot and trolls. He claimed that by doing so, I couldn't try to aim his orcs, only the goblins. Then we entered a long debate...
First off, I told him that in the case of a cannon, yes he'd be right. But even at that, orcs are 6f 5 ,if not , more, and goblins maybe 4 feet if I'm REALLY generous. They may block line of sight for archers or musketeers ( in the warhammer world apparently XD) but a mortar ...and even the rockets? They have an arc trajectory. The guy aiming knows there's a big group of orcs behind the goblins, and being an artillery crewman, he wants to aim towards the middle of his enemies forces, right?
I didn't want to metagame, but hell NOBODY( not even in warhammer) is dumb enough to not guess , in this case, that an orc army is behind a thiner-then-paper line of goblin archers ( that, by the way, didn't have any fanatics XD and it took him 5 rounds just to get to base contact because of them XD)
I pounded him the whole way ( which hasn't as fruitful as I thought it would be, thanks to the amazing accuracy of the rockets)