The Fairmile D dog boat's heavy guns and frequent use against torpedo boats make its motor-gunboat role clearer than some competing labels. Its battery included 6-pounders, 20 mm Oerlikons, Vickers machine guns, and depth charges, while radar could help crews establish a favorable position against a fast target. Crews could drop depth charges ahead of a pursuing Schnellboot so the underwater blast disrupted or disabled it. The maneuver turned an anti-submarine weapon into a surface-combat trap that left the German boat exposed to gunfire.
Chapter · 28:05-32:13
Fairmile D dog boats hunted Schnellboots with guns and depth charges
The heavily armed Fairmile D answered the E-boat threat and even used depth-charge blasts to disrupt fast surface targets.