PATROL NUMBER 10
PROTEUS and Subdiv 202 conducted a short refit for TINOSA. By April 18 the bevel gears in the bow plane rigging mechanism were replaced, and the mine detection apparatus had been overhauled. After a week of tests and training, she was ready for sea on April 26. One day was spent loading ship and on April 28, with fourteen new hands, an observer from the Royal Navy and a seaman photographer, TINOSA took departure Apra Harbor.
She set a course to the southeast for her assigned area which was in the vicinity of Truk Island. This heavily fortified island was now the subject of extensive bombing by the Army Air Force and TINOSA was to stand by to rescue crews of aircraft that were forced to abandon their planes into the sea. Lifeguard duty.
She entered the area at 1721 on April 29 and was submerged on lifeguard station at 0520 the next morning. By midday the liberators were over their target, and eighteen of them were observed bombing the island. Latham surfaced and established communications with them. In an hour the planes had completed their mission without any losses and headed for Guam. At 1430 a U.S. Navy patrol plane appeared which TINOSA attempted to contact without success.
May 1 produced no bombing activity and TINOSA took the opportunity to scout installations on some islands adjacent to Truk, and to take reconnaissance photographs in the North Pass. The next evening the bombing resumed and TINOSA cruised her lifeguard station, but no planes were lost.
The next day was spent on the surf ace. The bombers were back and completed their runs without mishap. Suddenly at 1626, an enemy patrol aircraft appeared, flew low over TINOSA, and dropped a bomb which exploded one hundred yards ahead. TINOSA submerged in great haste all the time expecting the other bomb that had been seen attached to the wing of the attacker, to fall. It didn't! There was minor damage. Some cork flew off the bulkheads, number one sanitary flooded when the outboard vent valves jarred open, and the fuse blew in the bow plane rigging circuit. One hour later Latham returned to periscope depth where he could see two aircraft searching the area. The plane that had attacked TINOSA had the code name of Jake and for the remainder of this patrol this Jake or one of his ilk would harass TINOSA. It was 1916 before it was safe to surface.
May 4 and 5 were uneventful except for several dives to avoid aircraft. Latham decided to utilize the lull in the bombing by taking TINOSA to reconnoiter the South Pass. May 5 and 7 were spent in that exercise and on May 8 she returned to her lifeguard station for the bombing was to start anew. For two days the liberators were over Truk but TINOSA was not needed.
There was no bombing the next day so Latham decided to scout Nomwin Island where there was reported to be a seaplane base. Perhaps the Jake that had been plaguing TINOSA could be caught on the water and disposed of with deck armament! There she submerged on May 10 and took a good look but the island appeared to be deserted. TINOSA went back to South pass until May 12 when she returned to lifeguard station.
Early that evening a flight of liberators appeared and conducted bombing runs. One aircraft reported that her rudder control had been shot out but thought she could fix it. TINOSA followed along the planes departure route, but there was no call for assistance.
The next day twelve liberators were in the area, but again TINOSA was not needed. TINOSA was submerged on station on May 14 when she received orders to return to Guam. At 1303 she surfaced and headed home. At 1934 that evening Ulil (Ulul) Island was sighted and TINOSA made preparations to conduct a shore bombardment of radio and meteorological installations there.
At 2129 she was 500 yards from shore and 1700 yards from the selected targets. She then opened fire and discharged thirty rounds of five inch shells and many rounds of smaller caliber stuff into the target area. An aircraft contact on SD radar caused TINOSA to break off the attack at 21 5 5. The only visible damage was a column of dense smoke. At 0048 she conducted her trek to Guam where she moored alongside PROTEUS at 07 07 May 16.
This run set a new TINOSA record for short runs and she was to have only a five day availability to prepare for her next sojourn into enemy waters.
Comsubpac declined to award TINOSA a successful run designation for run number ten in spite of the fact that she had conducted an apparently successful shore bombardment. This ended her string of nine successful patrol runs.
10th RUN TRIVIA
Duration of patrol: 19 days
Ship Contacts: 0
Air Contacts: 26