"Boots of Lead..."
See in text (Text of the Poem)
Recall that the term “creak” in the previous line has violent connotations, and consider that lead is the heaviest of base metals. The imagery of the “Boots of Lead” here thus creates an even more brutal, cruel tone. Further, considering that Dickinson often capitalized various words for emphasis, her capitalization of the “Boots of Lead” also gives them a heavy, powerful feeling in relation to the rest of the line.