I've been good keeping the same deployment. Never use non-pila javelins from any direction other than in the back. Never take guard mode off if facing it from the front or sides. Hit it with from behind with assualt infantry with guard off. Be prepared to switch it on if it turns to face you. Then you can also switch guard off for the front line unit that's now facing its rear. Cavalry I only do when its a really worn out phalanx and in wedge formation.