On the 24th the Marine commander learned that X Corps had received a document, for planning purposes only, providing that the Corps commander would become commander of the occupation forces. These were to consist of a single American division, probably the 3d Infantry Division, while the remainder of the Eighth Army returned to Japan.[118] [118] Smith, _Notes_, 403. Such indications seemed less reassuring after an incident which occurred at Wonsan on the evening of D-day. Two Marines, gathering firewood on the beach, had been blown to pieces by a booby trap. They were the only casualties from enemy action in the Wonsan landing.[119] [119] CG 1stMarDiv msg to subordinate units, 2001 27 Oct 50. Firewood being scarce in Korea, it was sometimes booby trapped. As early as 24 October the Marine division CP aboard the _Mount McKinley_ had been advised of an ancillary mission. Immediately following the landing one battalion was to be sent 39 miles south of Wonsan to the small seaport of Kojo. There it was to protect a supply dump of the ROK I Corps.[120] [120] Smith, _Notes_, 385; 1stMarDiv _SAR_, annex C (hereafter G-3 _SAR_), 5. The assignment went to 1/1. See Col J. Hawkins ltr to CMC, n. d., and LtCol R. E. Lorigan ltr to CMC, 8 Feb 56 for a discussion of the lack of planning and intelligence resulting from this order being received while underway. X Corps issued OI 13 on the 25th but General Smith did not receive his copy until two days later. Corps orders now assigned the Marine division a zone of action more than 300 road miles from north to south and 50 road miles in width. The missions prescribed for the Marines were those of an occupation rather than a fighting force: (1) To land on beaches in the vicinity of Wonsan. (2) To relieve all elements of I ROK Corps in Kojo and zone. (3) To protect the Wonsan-Kojo-Majon-ni area, employing not less than one RCT, and patrolling all roads to the west in zone. (4) To advance rapidly in zone to the Korean northern border. (5) To be prepared to land one Battalion Landing Team (BLT) in the Chongjin area rapidly on order. (6) To assist the 101st Engineer Group (C) (ROK) in the repair of the Yonghung-Hamhung railroad, employing not less than one engineer company.[121] [121] Smith, _Notes_, 393–394; G-3 _SAR_, 5–6. The 1st Marine Division in turn assigned these tasks to the following units in OpnO 18-50, issued at 0800 on the 28th but communicated orally to most of the designated commanding officers during the preceding 48 hours: (1) RCT-1 to relieve elements of I ROK Corps in Wonsan-Kojo-Majon-ni zone, establish necessary road blocks to prevent movement into the area, patrol roads, and destroy enemy in zone. RCT-1 to maintain one reinforced battalion at Kojo until further orders.