Sentence:  He thought of Simms Purdew , who once had risen at the edge of a cornfield , a maniacal scream on his lips , and swung a clubbed musket like a flail to beat down the swirl of Rebel <WSD>bayonets</WSD> about him . 
Meaning of the word marked with <WSD> tags:  a knife that can be fixed to the end of a rifle and used as a weapon