“SEC. 14. If such oflender, at the timeof stuch robbery, is armed with a dangerous weapon, with intent, if resisted, to kill or maim the person robbed; or if, being so armed, he wound or strike the person robbed; or if lie have :lny conffederates aiding and abetting him in such robbery present, and so armed; he shall be punished by imprisonment for a term of not exceeding twenty-five years, and not less than ten years.”