Expressions (phrases, clauses, etc.)
hide your true strength, and then later swiftly attack the unprepared enemy; first be like a (meek) virgin, later like a running hare
Proverbfrom Sun Tzu's Art of War
Also written 始めは処女のごとく後は脱兎のごとし【はじめはしょじょのごとくのちはだっとのごとし】