Definition of "otherwhiles"

At pleasure here we lie near Orleans;Otherwhiles the famish'd English, like pale ghosts,Faintly besiege us one hour in a month.

1591 (date written), William Shakespeare, “The Second Part of Henry the Sixt, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies. […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene ii]