FDR 1940; Wikimedia Commons

“We have had the lesson before us over and over again-nations that were not ready and were unable to get ready found themselves overrun by the enemy. So-called impregnable fortifications no longer exist. A defense which allows an enemy to consolidate his approach without hindrance will lose. A defense which makes no effective effort to destroy the lines of supplies and communications of the enemy will lose.”

FDR address to Congress May 1940.