N'yengoren strategy was a type of Klingon tactic, a stealth ground attack.
A N'yengoren attack was used to board the starship Hegh'TlhoS in the year 2290. (TOS novel: Excelsior: Forged in Fire)
In 2370, Jadzia Dax proposed to Kang that a N'yengoren strategy be used against the Albino's fortress, but Kang preferred a direct attack. (DS9 episode: "Blood Oath")