"commissioned" . "Royal Commission on the Defence of the United Kingdom" . . "Palmerston" . "Defence Act of 1860" . . "apprehensive about a possible French invasion" . "decision" . "fears of a French invasion" . . "fear of a French invasion" . . "1860 Royal Commission" . "1859 Royal Commission" . . "Royal Commission on the Defence of the United Kingdom" . "Palmerston fort" . "Royal Commission was set up in 1859" . . "Royal Commission" . . "Royal Commission on the Defences of the United Kingdom" . .