Avoiding the obvious approach through the corridor leading south from Sudong, the commander of the 371st CCF Regiment had dispatched a battalion along each of the ridgelines bordering the valley. Bursting flares and bugle calls signaled when the two assault units came abreast of the Marine positions on the lower reaches of Hills 727 and 698. Then, treading swiftly and silently in their rubber sneakers, the Chinese infantrymen swept down obliquely and struck Able and Fox Companies on the east and Baker on the west. Charlie on the slopes of Hill 698 was undisturbed. Where the Chinese met resistance, they slugged it out at close range with grenades and submachine guns. Where they found gaps, they poured through and raced to the low ground. To the Marines, the specific CCF objectives were not readily apparent in those hectic hours before dawn, for the enemy seemed to be everywhere.[253] [253] X Corps _PIR 44_, annex 2; 1stMarDiv _PIR 10_; 7thMar msg to CG 1stMarDiv, 1530 3 Nov 50; Shea Comments, 30 Apr 51. Shortly after the battle was joined high on the hillsides, Marines at Able Company’s CP heard the clanking sounds of a tracked vehicle on the MSR to the north. When the machine passed the rocket section at the roadblock without incident, they dropped their guards momentarily, believing it to be a friendly bulldozer. The big vehicle rumbled into the CP and stopped, one headlight glaring at exposed mortar crews and headquarters personnel. “Tank!” shouted Staff Sergeant Donald T. Jones, section chief of Able Company’s 60mm mortars. It was a Russian T-34, one of the five remaining to the 344th North Korean Tank Regiment, supporting the 124th CCF Division. The troops at the roadblock had been caught napping. A burst of machine-gun fire from the tank sent the lightly armed Marines scurrying for cover. The armored vehicle quickly withdrew to the road and drove farther south, into 1/7s’ CP. After a short, inquisitive pause, it rumbled toward the 1st Battalion’s 81mm mortar positions. The Russian 85mm rifle flashed four times in the darkness, but the shells screamed harmlessly over the mortars and detonated in the high ground beyond. Rocket launchers of Charlie Company and the recoilless rifles of 7th Marines Antitank Company opened up from positions around 1/7’s headquarters. At least one 75mm round struck home, and the belt of sandbags around the T-34’s turret began to burn. The tank swung back onto the MSR and headed north. Approaching Able Company’s roadblock, through which it had entered the Marine position, it took a hit from the 3.5-inch rocket section. In reply, one 85mm shell at pistol range all but wiped out the Marine antitank crew. The enemy vehicle, trailing flame and sparks, clanked around a bend in the road and disappeared.