Is there an abstractor that pulls the "verb" out?
{pu'u jamna} == process of (x1 wars on x2) == "war"?
{si'o damba} == concept of (x1 fights x2) == "combat"?
{zu'o damba} == activity of (x1 fights x2) == "fighting"?
You're thinking too literally. "Battle" is a happening. Happenings do not call. People call. It's an idiom. I suggest you attempt to translate the spirit of the idiom, which is how I arrived at ".ei damba", equating "Battle Calls" with "We are obligated to fight", but "mi bilga lo nu damba" is too formal to match the spirit.