This is my usual battle formation when I was playing Germania...

WWWWWWW WWWWWWW
WWWWWWWWWWWW

C AAAAAAAAAAAAAAAAA C
CC AAAAAAAAAAAAAAAAA CC
CCC CCC
CCCC GGGG CCCC


C: Cavalry
W: Spear Warband
A: Axemen
G: General


I put some warbands out diagnal to my main spearwarband line, I enclose the enemy for the most part to win.