Meanwhile, the Muslim scouting groups reported building up of bedouin troops of Bani Muharib and Tha‘labah of Ghatfan around Madinah.
According to the Sealed Nectar, Muhammad, with his Muslim warriors, hurriedly set out to discipline these new outlaws, cast fear into their hearts and deter them from perpetrating further practices.
[1][3] Mubarakpuri says that in the context of these invasions, one of significance was the Dhat Ar-Riqa campaign which some scholars claim, took place in Najd (a large area of tableland in the Arabian Peninsula) in Rabi‘ Ath-Thani or Jumada Al-Ula, A.H. 4.
The most authentic opinion according to Safiur Rahman al Mubararakpuri, however, is that Dhat Ar-Riqa‘ campaign took place after the fall of Khaibar (and not as part of the Invasion of Najd).
The rules relating to the prayer of fear which Muhammad observed at Dhat Ar-Riqa‘ campaign, were revealed at the Asfan Invasion and this scholars say, took place after Al-Khandaq (the Battle of the Trench).