of > from, by
3 And sovereign favour towards chastity,
sovereign > supreme
4 Do succour send to her distressed case:
case > state; plight
5 So much high God does innocence embrace.
embrace > take in hand, include; hence: protect
6 It fortuned, whilst thus she stiffly strove,
stiffly > strongly, violently; resolutely
7 And the wide sea importuned long space