San Francisco is strongly fortified against attack from the sea. Land batteries and mines in the outer harbor render her "serene, indifferent of fate"
A fleet of hostile aeroplanes, flying at a height of two miles, if necessary, would be equally serene and indifferent of both batteries and mines
Photographs By E. Carl Wallen, from the Silas Christofferson Flying Boat
Fort Winfield Scott stand beside the Golden Gate at its narrowest part. Its cannon have long since been removed and the old fort is but a picturesque landmark, the haunt of lovers and the martial inspiration of small boys on happy Saturdays. The bristling breastworks which top the hill above its harmless ramparts would be quite as useless against the marksmen of the air
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