In the story, Samson is a slave who performs heavy labors for the rag-tag band of rebels.
The rebels often poke fun at Samson because of his apparent lack of mental ability. Because Samson is strong, he is the one who draws water for the camp and gathers the firewood. Essentially, Samson is characterized as "stupid" but strong.
Rosh, frustrated by his inability to communicate with Samson, eventually leaves Samson in Daniel's care. For his part, Samson is unrelentingly loyal to Daniel. After all, Daniel is the one who frees Samson from his shackles.
Later in the story, Joel is captured. Since Rosh will do nothing to rescue Joel, Daniel and several of his rebel friends decide to attempt it.
Unbeknownst to them, Samson follows the small group of rebels as they track the movements of the Roman soldiers and their prisoners. At an opportune moment, Samson dislodges a great rock, which rolls down the hill.
The Roman soldiers leap out of the way, and a great melee occurs. In the confusion, Samson takes hold of Joel's chains and breaks them open. This allows Nathan and Kemuel to pull Joel to safety.
Later, Joel relates that Samson was wounded in the attack. When Daniel asks about going after Samson, Kemuel tells him that the Roman soldiers took Samson with them. Essentially, Samson sacrificed his life so that the rebels could rescue Joel.