In the 1940s and 1950s, Whitehall still had working farms, and it was a mixed income area with mainly small houses. It was still a village in the 1940s, and residents filed for incorporation in 1947. In 1952 the borders expanded east to the country club and Big Walnut Creek. Rapid growth meant that it became a city during the 1950s. The first shopping center strip in the country was built and opened in Whitehall in 1948, called Casto's Town and Country. The National Road passed through Whitehall. In August 1970, two department stores in Whitehall were bombed as part of a robbery scheme. William Harris was arrested after fleeing the scene. He was pursued and captured by motorcyclist Roger Penwell. Penwell pursued despite gunfire. He received the Carnegie Hero Fund's Bronze Medal and was amply rewarded for heroism. Penwell's actions enabled police to locate more of Harris's bombs, saving property and many lives. Harris was a 1st lieutenant in the.