Based on the clue 'at by of are all this part of speech', what is the answer?

Based on the clue 'at bull run gen barnard bee gave this confederate ...', what is the answer? Based on the clue 'at bull run general bee referred to thomas jackson...', what is the answer? Based on the clue 'at bunker hill colonel prescott is said to have or...', what is the answer? Based on the clue 'at bunker hill the colonists cant obey this comman...', what is the answer? Based on the clue 'at cambridge charles got his university colors in ...', what is the answer? Based on the clue 'at cambridge this lord of poetry became a lifelong...', what is the answer? Based on the clue 'at cambridge wordsworth saw a statue of this scien...', what is the answer? Based on the clue 'at camp it signals the afternoon roll call in the ...', what is the answer?