Best timed-attack formation! 

Your objective is to use the front line to protect the heavy side backline and the angels. Counter formations apart, You can send 2x2 formation : even cavalry, even infantry/odd infantry( heavy side) + angels + even mages, even archers/odd archers( heavy side). 3 x 3 formation : even cav, even inf, odd inf ( heavy side)+ even mages, even archers, odd archers ( heavy side). ( No angels in this setup) Thus, heavy side troops maintain their position in the same line. Nb : counter formation is an advanced technique, so formation changes depend on enemy formation.

@@LordPikaGaming thanks for the anwer. Now i play 120/140 inf t13, all angels and rest archers. Its give me around 500k or 800k kills more or less (depends of enemy configuration). Maybe i've change my configuration 🤔

Kills vary depending on the opponents' total defence value( including all bonuses). The amount of kills cannot be compared to formations. Backline is the damage-dealer, and the front line acts as a protective wall to block incoming damage. So you win if you knock off the backline. Additionally, you have a better chance of winning if the enemy front line is destroyed or the opposition backline takes longer to hit your front line.