While "Mother" Mandelbaum engineered house and dry goods store robberies, Grady set his mind and energies on the great banks. As bold as the Manhattan affair was his assault on a West Side bank. The vaults of this bank were surrounded by a three-foot wall of solid concrete.
Grady opened a first-class saloon next door, and as soon as he got his bearings installed a steam engine in the cellar. This engine was supposed to run the electric light dynamo and an air pump. In reality it was there to drill a hole into the bank next door.