Explanation

Ghazwa e Ahzab and Battle of the Trench is the second name of Ghazwa-e-Khandak

The Battle of Khandaq (Ahzab) was fought on 5 A. H (627).

 it was the 30-day-long fight of Yathrib by Arabian and Jewish tribes

Hazrat Salman Al-Farsi suggests digging the trench at the time of the Battle of Khandaq

10000 Munafiqeen were in Ghazwa-e-Khandaq