On 15 September 1944, U.S. forces invaded the Palau Islands, landing on Angaur and on Peleliu. "Ro-47" got underway from Kure on 17 September 1944 with orders to attack the U.S. invasion fleet off Peleliu, assigned a patrol area south of the Palaus. On 24 September 1944, she received an order to proceed at full speed to a new patrol area in the Philippine Sea east of the Palaus. The Japanese never heard from her again.