Sentence:  By 1600, the ratio of <WSD>pikers</WSD> to gunmen was roughly 3:2. By mid-century the ratio was only 1:2, and by 1670 there was just one <WSD>piker</WSD> to every three gunmen in the "French Army". 
Meaning of the word marked with <WSD> tags:  A soldier armed with a pike, a pikeman.