Quite a story of what happened there and that was his second trip to the west coast. The fact that McLaughlin even helped him, being basically an enemy trader, was remarkable.
Smith himself was killed by Comanches a couple years later on the Cimmaron river in what is today Oklahoma.
In some cases the natives got a raw deal and in just as many cases they got what they deserved. This was one case where they simply decided they were going to kill the white men and take their belongings. That's what they did to other indian tribes so it was nothing new. Smith had told the men under no circumstances do not let them into camp while he was gone. But they were very shifty and managed to infiltrate the camp.
One of the versions I read of the story supposed that as Smith was a Bible-toting man he would not have approved of his men consorting with the Indian ladies. They might have been taking advantage of his absence thinking they might do a little "trading". Which is why they defied his "keep the Indians out of camp" order. The only man that actually survived the attack itself was Arthur Black who escaped into the woods and made his way along the northern Oregon coast and on to the Hudson Bay fort on the Columbia.
Thankfully, second in command Roger's expedition journal was recovered near present day Coquille and was saved for posterity, or most of what we know of the second expedition would have been lost.