"The S.S. William D. Pender had no contact with the enemy. On several occasions the escort vessels dropped depth charges but no apparent result. However, at 0145 on September 12, 1943, while traveling in convoy from Palermo enroute to Bizerte the ship in position broad to the port bow of the S.S. William D. Pender received a torpedo in her #2 hold with resulting damage and personnel casualties. General Quarters was immediately sounded and held on the S.S. William D. Pender but the enemy was not located."
In other sources that I have found, the William Travis was reported to be torpedoed near Bizerte on that date.