yep, I (Italian) was betrayed by my polish ally when we were both attacking the Huns.

I let the Polish attack the Huns and they got routed, running for their lives past my lines.

The Huns were chasing victoriously and only ran into my missile battery of 10 archers, 4 spears in a wall in front.

due to low morale units under fire, the Huns routed upon intact with my spear wall.

I gave chase with my steppe cav unit and RK general.

However, I saw my archers flashing melee and realized that my Polish allies rallied and were back stabbing me

I wheeled my spear wall around, got my archers out of there and then peppered them now.

In the end, I killed the Polish easily but I did lose a whole unit of archers from that battle.