"'Impossible' is a word found only in the dictionary of fools."
Between December of 1941 and VJ Day (15 Aug 45), the WW I Monument Castle Tower atop Mount Battie, overlooking Penobscot Bay on the Maine Coast, was occupied continuously by volunteer members of the "Home Guard," mostly ageing WWI veterans. They scanned the Bay, day and night, for signs of Nazi submarines.
Most carried personally-owned 1903 Springfield Rifles and Colt 1911 pistols. They were always armed!