What passed like a glorious roll of the drum in poem slaves dream?

You are referring to the poem "The Slave's Dream" by Henry Wadsworth Longfellow. The line you're asking about is:

> "And they say that over the hills of snow / The sun is bright, and the flowers grow."

In the poem, the slave dreams of freedom and escapes to a land where he is no longer enslaved. The line about "a glorious roll of the drum" doesn't appear in the poem.

It's possible you are thinking of another poem, or perhaps you are remembering a particular interpretation of the line about the sun and flowers.

Here's the relevant part of the poem:

> "He saw his mother, and his child / His wife, and all his loved ones mild; / He saw them in a happy land, / And in his dream he reached his hand, / And grasped their hands, and they were glad / To welcome him, and he was glad."

This section describes the slave's happiness in his dream, a feeling that is contrasted with the harsh reality of slavery.