Sentence:  Where he speaketh of his passage over the River of "Rheine", towards "Germanie", he saith, that deeming it unworthy the honour of the Romane people, his army should passe over in shippes, he caused a bridge to be built, that so it might passe over <WSD>drie-foot</WSD>. 
Meaning of the word marked with <WSD> tags:  With dry feet; without getting the feet wet.