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Dear Mr. Boyce,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Artillery Unit Records, ca. 1965 - ca. 1972 that includes various daily journals of the 3/18th Artillery for 1969 in Boxes 462 - 480. No after action reports of the 3/18th or LZ Crunch were located. We were unable to locate specific records of C Battery. Records of C Battery may have been incorporated into the files of the 3/18th Artillery.
We also located a series titled Records of "A" Detachments, 1962 - 1970 that includes file units such as 5th Special Forces Group, Det. A-108: Patrol Reports - Camp Minh Long: 1969 - 1970; 5th Special Forces Group, Det. A-108: Monthly Intelligence Summaries - Camp Minh Long: Jan. 1969 - Sep. 1970; and 5th Special Forces Group, Det. A-108: Historical Summary of Camp Minh Long. The file units may contain information about the attack.
For access to these records from the Records of the U.S. Forces in Southeast Asia, 1950 - 1976 (Record Group 472), please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!