There is no doubt that the blast effect of the new German bombs has increased. In these circumstances, and indeed on general grounds, would it not be well to provide, so far as possible, slit trenches and blast or splinter cover for anti-aircraft personnel not on duty during the air raids? Each raid is likely to be short on account of the enemys reliance on Window, and the anti-aircraft personnel, a large proportion of whom are women, should be directed to use the slit trenches when not otherwise employed during the rids. In most cases the batteries should be able to do the bulk of the work themselves if materials are provided. Where outside assistance is required priority should be given to the most exposed positions.
Winston S. Churchill, Closing the Ring