I have three scratch that, five favorites
#1 the flaming pig
when the romans were faced with a formation they would slather a pig in tar and light it on fire then send it into the enemy ranks thusly splitting the formation. then the cavalry would go finish them off
#2 this is my own personal undefeatable exept by siege eapons shield wall.
first two rows cavalry for obvious reasons(mainly pincers and to herd the enemy into my shield wall)
then one row shield wall soldiers w/ two shields and one pike ea.(the second can be lifted in case of a volley of arrows)
then one row glavemen in event of a combo infantry/archer attack the pike can be handed back to the glaveman
behind that two rows archers interspersed with unarmed shield wall soldiers in case of a volley of arrows(note that bows may be replaced with crank action c-bows)
then behind them, rear facing glavemen and shield wall soldiers w/pikes
ten flanking the formation is any offensive infantry and one row of halberdeers
it's easier to explain with a diagram
#3 I have noidea what this one is called
the persian imortals used bows and spears so that they could rain arrows down on shield walls and while the shields of the shield wall were up to avoid arrows the spear wielding immortals would charge in and stab the enemy.
#4 surround them with swords halberds and spears then shoot holes in them with bows.
#5distract the enemy with a big army then when they attack surround them w/ archers and kill dem allz!
I have a problem with geurilla (hit and run) tactics, you have to know the lay of the land, it would be an inefective invasion tactic (for the most part) and if you had only just conquered an area and someone attacked you, you would be much less able to pull it off.
He who thinks you should look at the box that says "Quaraga" if you want to find out his username (about as useful to you as his real name). he only wants you to look so he can laugh about you looking there because he's a total smart...