The figure of speech illustrated in the sentence is "metaphor".
A metaphor is used when making an implied comparison by describing an action that cannot be taken literally. In this case, we are comparing an action performed by students using the verb "stampeded" which is commonly used when animals suddently rush.
A simile is a comparison made using the words "like" or "as".
Personification means providing human qualities to non-human objects.
The main idea in this passage is that A. Harvey was small for his age, but he was strong. B. Harvey loved football more than chess. C. Harvey wanted to play football in spite of his size. D. Harvey’s brother preferred chess to football.
B. sentence structure throughout.
C. paragraph lengths.
D. topic headings in your outline.