Don’t be stupid. Extreme Unction (the final rites) includes Holy Communion if possible.
You’re the one who brought up the battlefield scenario...widespread Communion on a raging war zone isn’t really possible...
I brought up the battlefield scenario because it was relevant. What world do you live in in which a dying soldier cannot be given Holy Communion? It does not have to be accompanied by a High Mass, you know. A small packet of consecrated Hosts, administered quickly was often done.