WWII Operation Sunfish - 11th April 1945 - Bombardment of Sabang and Oleheh, Sumatra by Force 63 Under Command of Vice Admiral H.T.C Walker -HMS Emperor -Admiral Sir Charles Madden Signed Commemorative First Day Cover - 11th April 1989. 5x7 inches Operation Sunfish was a military operation by Allied troops in April 1945. It involved the battleships HMS Queen Elizabeth and French battleship Richelieu. USS Pybus was initially a United States Navy Bogue-class escort carrier. The ship was transferred to the United Kingdom for service in the Royal Navy as the Ruler-class escort carrier HMS Emperor (D98) as part of the Lend-Lease program of World War II.