Related to my earlier army list and my thoughts on deploying said army, this time I thought I'd write a little about how the army should behave in battle. I fear I might have taken on more than I can chew on this one, as the strategy you employ tend to change as often as your opponent. With that said, there's a few things that I'm looking to do in most of my games.
In general, the greenskin way of fighting has to be swarming your opponent and overall just win the game by having more stuff than the enemy, and pray that your units will do what they're supposed to. That's why I always try to limit animosity, as that can really just mess up a good plan. If you've read my list, you'll notice I only really have 200 points out of 2500 points that's prone to squabble - the squig herd and the wolf riders. The black orc characters will lead both the orc boyz unit, and black orc units and trolls won't squabble, so that's 4-5 combat blocks that will do what I need them to do, which is get into combat when they're supposed to.
Da boyz will deal with da nasty stuff
My rule of thumb in regards to opponents is that either they'll have less units that want to fight than I do but the ones that want to fight usually fight better than anything I can muster. Or, my opponent has an equal amount or more fighting units than I do, but my units will fight better. When you consider it for a moment, it's pretty obvious.
In either case, I always like to bring my units of orc boyz into combat against the nastiest fighting block that my enemy can muster, because most of the times, even though I'll lose the fight, my bosses will kill enough enemies to make them feel it, and my boyz will be more than the enemy so they won't run away immediately. If I do get the charge, I usually bring a chariot charging alongside the boyz. The nice thing about chariots is that they're able to rank up corner to corner against an enemy unit and still fight just as well, without decreasing how many boyz get to smash heads. If you're lucky, and roll well on impact hits, such a combo-charge can sometimes break an enemy on the first round, since the boyz are usually enough to prevent the enemy being steadfast. If they don't break, usually because they're so much better at fighting than you are (brrr, Chaos Warriors...) at least you've ensured that neither you or the enemy will be running away anytime soon, and since they're better at fighting than you are, it usually means they'll have less combat units so you can swarm them.
Big 'uns bashes puny 'uns , then hit da flanks!
Da little 'uns stand in da way
As for my artillery and their targets, these things tend to vary so much depending on what I'm up against. In general, the Spear Chukkas usually fire at either monsters in hopes of overperforming and taking out 200-300 points on a lucky dice roll, or enemy war machines that could hurt my combat units. The Doom Diver is even better at hitting flying skirmishers such as harpies, ungors or furies that seek to divert my hard hitters from getting in the flank charge. Finally, the Rock Lobber can perform multiple roles, and you really need to consider your target priority and the effectiveness of the shot before you fire. Anything on a 20mm base, with low toughness and moderate armor are good shots (elves make for excellent rock lobber targets) while models on 25mm bases, with higher toughness and excellent armor make for less effective shots (chaos warriors are horrible targets). It can also be a good idea to take aim for enemy monsters with the rock lobber, as it's still a 1/6 chance of a direct hit, which equals to a S9 D6 wound rock in the face. All in all, my artillery are usually rubbish, but they're so cheap and sometimes they do overperform with a lucky dice roll that wins you the game, that it's always a good idea to bring a few to every battle.
Plan is a good 'un
That's it for the strategy part of my army list breakdown. I hope I managed to make some sense and I'm happy if some of my readers ended up learning something for their own army, whether orcs or not. If you have questions, I'd love to hear them and will do my best to answer them.