Sentence:  What art thou that vſurp'ſt this time of night, / Together with that Faire and Warlike forme / In which the Maieſty of buried Denmarke / Did <WSD>ſometimes</WSD> march&#8239;: By Heauen I charge thee ſpeake. 
Meaning of the word marked with <WSD> tags:  On a certain occasion in the past; once. (16th-17th c.)