The bomber will always get through was a phrase used by Stanley Baldwin in 1932, in the speech "A Fear for the Future" to the British Parliament. He and others believed that, regardless of air defences, sufficient bomber aircraft will survive to destroy cities.
Read more about The Bomber Will Always Get Through: Baldwin's Argument, Basis in Fact, Strategic Bombing in Combat, "The Bomber Will Not Always Get Through", Recent Re-use, See Also