Prestonian-class Frigates
The Prestonians were a group of 21 Second World War frigates reactivated by the Royal Canadian Navy (RCN) in the 1950s for antisubmarine warfare (ASW). This was a stopgap measure to meet Canada’s North Atlantic Treaty Organization (NATO) force goals until the purpose-built St Laurent-class destroyer escorts came into service. Although originally built as Anti-Submarine Warfare (ASW) vessels, the Prestonians had to be extensively modified to meet the more complex demands of Cold War ASW, which they performed until withdrawn in the mid-1960s.