What is the meaning of "hells of fire"?(No Men Are Foreign)

The poet in this poem discourages hatred and war amongst different countries. He says country men of one country are not different form another. he says raising a gun and firing against people of one country means you are betraying yourself as well as harming the innocent who do not want war. Hells of fire means that the gun fire that comes out form the guns used by countries against each other, these guns also take the life of innocent people.