"You cannot invade the mainland United States. There would be a rifle behind every blade of grass." is a quote by Isoroku Yamamoto, Commander-in-Chief of the Imperial Japanese Navy during World War II. Of course it was originally stated in Japanese, this is the English translation.
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Unfortunately there is no evidence that Yamamoto ever said this. There is a reference link below on this.
HOAX - NO PROOF IT WAS EVER SAID.
Apparently, there is no proof that this was ever said, that is correct. However, it should be noted that Yamamoto spent time in the U.S., attending Harvard for two or more years. He spoke fluent English and had a keen understanding of the industrial capabilities of the United States. He did not want war with the U.S. for this, and possibly other reason. Therefore, while he may not have made this now-famous quote, it is likely that he may have believed it, therefore being a good person to attribute it to.
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He would not attack America because he knew Americans had guns and knew how to use them... that there was "a gun behind every blade of grass."
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Supposedly. The quote "You cannot invade mainland America. There would be a gun behind every blade of grass" has been widely attributed to him, but it has never been substantiated.
There have been several D-Days. The first was Sept 12, 1918 with the invasion of Saint-Mihiel. The most famous was June 6, 1944 with the invasion of Normandy. Every amphibious landing in WWII (including the Pacific landings) had a D-Day.