Sentence:  That is a contrary definition, which is laid down in opposition to the actions which those who are the hearers of the speech have done; as if any one were to be speaking before Alexander the Great against some <WSD>stormer</WSD> of a city, and were to say that nothing was more inhuman than to destroy cities, when Alexander himself had destroyed Thebes. 
Meaning of the word marked with <WSD> tags:  Someone who storms.