The night of 15–16 September passed quietly for both of the infantry regiments. At 2000 on D-day the 3d Battalion crossed over the causeway from Wolmi-do to rejoin RCT-5. The most dramatic action on either regimental front was an episode in the Cemetery Hill area. Two Marines mistakenly wandered out in front of the high ground and were cut down by enemy fire from a cave at the base of the hill, just below the lines of Company A, 5th Marines. Repeated attempts to reach the fallen men were thwarted by submachine gun fire from the recess, until a ROK interpreter, threatening the use of tanks, persuaded the occupants to surrender. As a squad of North Koreans filed out in submission, troops from Able Company rushed forward to get their two comrades. One of the Marines was already dead; the other lay mortally wounded.[182] [182] Muetzel interv, 6 Jan 55. In the middle of the night, the 1st and 5th Marines received General Smith’s OpnO 3-50, directing them to attack after dawn. Murray’s regiment, by previous plan, would march through the southern part of Inchon, leaving the heart of the seaport to be cleared by the KMC. About three miles inland, the 5th Marines would reach the O-2 Line coming abreast of Puller’s front of the night before. (Thus, the O-1 and O-2 Lines were one and the same in the 1st Marines zone). Tied in along the Inchon-Seoul Highway at Hill 117, the two regiments would drive eastward to the O-3 Line, approximately five miles inland. This last arc was the goal specified in Smith’s attack order.[183] [183] 1st MarDiv _OpOrders 2-50_ and _3-50_; O. P. Smith _Notes_, 346. Murray’s tactical plan was dictated by the simple necessity of getting out of Inchon as quickly as possible. The 5th Marines would therefore attack in a column of battalions, with Roise’s 2d in the lead, followed by the 1st and 3d in that order. Two hills, located north of the highway on the outskirts of the city, were designated Regimental Objectives D and E. In taking this high ground, 2/5 would automatically control the 5th Marines’ segment of the O-2 Line and seal off the Inchon Peninsula in conjunction with the 1st Marines. This would leave a secure pocket for the great ship-to-shore build-up commencing on the morning tide. Following a brief orientation at dawn, Captain Jaskilka led Company E forward from the British Consulate. Unopposed, the column passed the inner tidal basin, where Fox Company fell in behind. In the meantime, Company D left its positions atop Observatory Hill and brought up the rear of the battalion formation. Inchon’s streets were strangely quiet during 2/5’s advance. Frightened civilians peeped from windows and alleyways, but the enemy was nowhere to be found. The sprawling seaport seemed dead.