Original sentence: I-174'''s torpedoing of the two ships was probably the most successful individual attack made by a Japanese submarine off Australia.LST-469 had been carrying troops and supplies for Operation Chronicle, an amphibious landing at Woodlark and Kiriwina islands on 30 June, and this operation was hindered by her not being available
Edited sentence: I-174'''s attack was probably the most successful made by a Japanese submarine off Australia.LST-469 had been carrying troops and supplies for Operation Chronicle, an amphibious landing at Woodlark and Kiriwina islands on 30 June, and this operation was hindered by unavailabilty