Old topic, just thought I'd clear some things.
The conflict was about a small island not defined in the border agreement between Russia and China, the island of Damanskiy. The conflict happened in 1969, on March 2 and March 15. About 300 Chinese soldiers attacked a platoon of 55 Russian border troops that were patrolling the island. In the initial surprise attack, 31 Russian troops were killed, and 14 were wounded, but the battle was won by the Russians. On march 15, the Chinese reinforced their positions and attacked again. Chinese brought serious equipment and a division of ground troops. Even though Russians held their positions for about 2 hours, reinforcements were never brought in, and they had to retreat in view of the superior forces that the Chinese had amassed. The Soviets realized that they didn't how enough men that day to take the island, and used their 'secret' artillery equipment, Grad (hail), or BM-21. Fire was opened upon Chinese positions, essentially obliterating the island with tremendous firepower. Most of the Chinese troops were killed, and after that major combat operations were over. There were some minor firefights afterwards, but in September of the same year, the island was given to the PRC.
58 Russian soldiers were killed, 94 wounded. 4 soldiers recieved the highest military award for their actions, Hero of the Soviet Union, 2 awarded posthumously.
It's estimated about 700+ Chinese troops were killed in combat. I guess we'll never know the real amount.