Which armies fought with the British army?

No army fought with the British Army. Or if you meant which army the British Army fought as enemies, it's the German army. (I think - 80% Sure)

well actually there were the itailians , and Germans attacking us

and before that we had the Russians

right now we have terrerists

and back in 1812 we had those Americans fighting us

btw nobody one because nothing was gained

and theres probly more ,, those wer of the top of my head

Numerous armies fought with the British Army throughout history; check out any war involving the British and you'll find out who those were.