My opinion on whether it was right for Hiawatha to turn down the request of the Chief Sachem is
Yes. This is so because he set out to pursue peace and if that position will make the Atotarho tribe unite with their brothers, then his mission will be accomplished.
Hiawatha, a follower of the Great Peacemaker wanted to make the five Iroquois tribes united. Four agreed except the Atotarh tribe.
Hiawatha turned down the request to be the Chief Sachem and gave it to the leader of the Atotarho tribe so that his mission to achieve peace will be realized.
This move will also prevent war from occurring. So, it was right for Hiawatha to turn down the request to be the Chief Sachem.
Yes it is becase a Metaphor is The use of a word or phrase to refer to something that it is not, invoking a direct similarity between the word or phrase used and the thing described (but in the case of English without the words like or as, which would imply a simile); the word or phrase used in this way; an implied comparison.