During their lengthy service with the Royal Navy "Leander"s were employed during the Indonesia–Malaysia confrontation in 1963-1966. The 1973 and 1975-6 Cod Wars in the latter of which HMS "Diomede" suffered severe damage with a 30 feet gash in its hull after being rammed by an Icelandic Coast Guard gunboat. The frigates with their thin hulls being much less suited to this duty than the later offshore patrol vessels.