In which Ghazwa did the Muslims dig a defensive trench around Madinah on the advice of Hazrat Salman Farsi (RA)?

Explanation

Ghazwa-e-Ahzab (also known as the Battle of the Trench / Ghazwa-e-Khandaq) took place in 5 AH (627 AD). Upon the strategic advice of Hazrat Salman Farsi (RA), a Persian companion, Muslims dug a wide trench along the northern border of Madinah to fend off a confederacy of 10,000 enemy troops. For test prep, remember that Ghazwa-e-Tabuk (9 AH) was the last Ghazwa led by Prophet Muhammad (PBUH).