Making the Channel a no-go area before D-Day

The immediate concern before the invasion was preventing German destroyers and fast attack craft from reaching slow, crowded assault and troop convoys. The screen was built around Fairmile D Dog Boats, Tribal-class destroyers, and the 10th Destroyer Flotilla. These forces were meant to interpose themselves between German craft and their objectives instead of beginning a pursuit after an attack developed. One Dog Boat commander was credited with driving off an enemy even though doing so meant giving up a possible kill. Success was measured by deterrence and exclusion: scattered intruders might still appear, but mass attacks were to be kept out of the Channel and away from the convoys.